%
-% (c) The University of Glasgow, 2000
+% (c) The University of Glasgow, 2002
+%
+% The Compilation Manager
%
-\section[CompManager]{The Compilation Manager}
-
\begin{code}
+{-# OPTIONS -fvia-C #-}
module CompManager (
- cmInit, -- :: GhciMode -> IO CmState
+ ModuleGraph,
- cmLoadModule, -- :: CmState -> FilePath -> IO (CmState, [String])
+ CmState, emptyCmState, -- abstract
- cmUnload, -- :: CmState -> IO CmState
+ cmInit, -- :: GhciMode -> IO CmState
- cmSetContext, -- :: CmState -> String -> IO CmState
+ cmDepAnal, -- :: CmState -> DynFlags -> [FilePath] -> IO ModuleGraph
- cmGetContext, -- :: CmState -> IO String
+ cmLoadModules, -- :: CmState -> DynFlags -> ModuleGraph
+ -- -> IO (CmState, [String])
+
+ cmUnload, -- :: CmState -> DynFlags -> IO CmState
#ifdef GHCI
- cmRunStmt, -- :: CmState -> DynFlags -> String -> IO (CmState, [Name])
+ 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)
- cmTypeOfExpr, -- :: CmState -> DynFlags -> String
- -- -> IO (CmState, Maybe String)
+ cmTypeOfName, -- :: CmState -> Name -> IO (Maybe String)
- cmTypeOfName, -- :: CmState -> Name -> IO (Maybe String)
+ HValue,
+ cmCompileExpr, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, Maybe HValue)
- cmCompileExpr,-- :: CmState -> DynFlags -> String
- -- -> IO (CmState, Maybe HValue)#endif
+ 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 DriverPipeline
+import DriverState ( v_Output_file )
+import DriverPhases
+import DriverUtil
+import Finder
+#ifdef GHCI
+import HscMain ( initPersistentCompilerState, hscThing,
+ hscModuleContents )
+#else
+import HscMain ( initPersistentCompilerState )
+#endif
import HscTypes
-import RnEnv ( unQualInScope )
-import Id ( idType, idName )
-import Name ( Name, lookupNameEnv, extendNameEnvList,
- NamedThing(..) )
+import Name ( Name, NamedThing(..), nameRdrName, nameModule,
+ isHomePackageName, isGlobalName )
+import NameEnv
+import Rename ( mkGlobalContext )
import RdrName ( emptyRdrEnv )
-import Module ( Module, ModuleName, moduleName, isHomeModule,
- mkModuleName, moduleNameUserString, moduleUserString )
-import CmStaticInfo ( GhciMode(..) )
-import DriverPipeline
+import Module
import GetImports
-import Type ( tidyType )
-import VarEnv ( emptyTidyEnv )
-import HscTypes
-import HscMain ( initPersistentCompilerState )
-import Finder
-import UniqFM ( lookupUFM, addToUFM, delListFromUFM,
- UniqFM, listToUFM )
+import UniqFM
import Unique ( Uniquable )
-import Digraph ( SCC(..), stronglyConnComp, flattenSCC )
-import DriverFlags ( getDynFlags )
-import DriverPhases
-import DriverUtil ( splitFilename3 )
+import Digraph ( SCC(..), stronglyConnComp, flattenSCC, flattenSCCs )
import ErrUtils ( showPass )
+import SysTools ( cleanTempFilesExcept )
import Util
-import DriverUtil
-import TmpFiles
import Outputable
import Panic
-import CmdLineOpts ( DynFlags(..) )
+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 ( hscStmt )
-import PrelGHC ( unsafeCoerce# )
+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, fromJust )
+import Maybe
\end{code}
pls :: PersistentLinkerState -- link's persistent state
}
-emptyCmState :: GhciMode -> Module -> IO CmState
-emptyCmState gmode mod
+emptyCmState :: GhciMode -> IO CmState
+emptyCmState gmode
= do pcs <- initPersistentCompilerState
pls <- emptyPLS
return (CmState { hst = emptySymbolTable,
ui = emptyUI,
mg = emptyMG,
gmode = gmode,
- ic = emptyInteractiveContext mod,
+ ic = emptyInteractiveContext,
pcs = pcs,
pls = pls })
-emptyInteractiveContext mod
- = InteractiveContext { ic_module = mod,
- ic_rn_env = emptyRdrEnv,
+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 }
-defaultCurrentModuleName = mkModuleName "Prelude"
-GLOBAL_VAR(defaultCurrentModule, error "no defaultCurrentModule", Module)
-
-- CM internal types
type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
emptyUI :: UnlinkedImage
-- Produce an initial CmState.
cmInit :: GhciMode -> IO CmState
-cmInit mode = do
- prel <- moduleNameToModule defaultCurrentModuleName
- writeIORef defaultCurrentModule prel
- emptyCmState mode prel
+cmInit mode = emptyCmState mode
+
+-----------------------------------------------------------------------------
+-- 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 -> String -> IO CmState
-cmSetContext cmstate str
- = do let mn = mkModuleName str
- modules_loaded = [ (name_of_summary s, ms_mod s) | s <- mg cmstate ]
-
- m <- case lookup mn modules_loaded of
- Just m -> return m
- Nothing -> do
- mod <- moduleNameToModule mn
- if isHomeModule mod
- then throwDyn (OtherError (showSDoc
- (quotes (ppr (moduleName mod))
- <+> text "is not currently loaded")))
- else return mod
-
- return cmstate{ ic = (ic cmstate){ic_module=m} }
-
-cmGetContext :: CmState -> IO String
-cmGetContext cmstate = return (moduleUserString (ic_module (ic cmstate)))
-
-moduleNameToModule :: ModuleName -> IO Module
-moduleNameToModule mn
- = do maybe_stuff <- findModule mn
- case maybe_stuff of
- Nothing -> throwDyn (OtherError ("can't find module `"
- ++ moduleNameUserString mn ++ "'"))
- Just (m,_) -> return m
+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
-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
+ | 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,
- ic_type_env = type_env,
- ic_module = this_mod } = icontext
+ ic_rn_local_env = rn_env,
+ ic_type_env = type_env } = icontext
(new_pcs, maybe_stuff)
- <- hscStmt dflags hst hit pcs icontext expr
+ <- hscStmt dflags hst hit pcs icontext expr False{-stmt-}
case maybe_stuff of
- Nothing -> return (cmstate{ pcs=new_pcs }, [])
- Just (ids, bcos) -> do
+ Nothing -> return (cmstate{ pcs=new_pcs }, CmRunFailed)
+ Just (ids, _, bcos) -> do
-- update the interactive context
let
- new_rn_env = extendLocalRdrEnv rn_env (map idName ids)
+ 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
- -- Extend the renamer-env from bound_ids, not
- -- bound_names, because the latter may contain
- -- [it] when the former is empty
- new_type_env = extendNameEnvList type_env
+ -- 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_env = new_rn_env,
- ic_type_env = new_type_env }
+ 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]
- hvals <- thing_to_run
-
- -- get the newly bound things, and bind them
- let names = map idName ids
- new_pls <- updateClosureEnv 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
+ -> 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
-----------------------------------------------------------------------------
#ifdef GHCI
cmTypeOfExpr :: CmState -> DynFlags -> String -> IO (CmState, Maybe String)
cmTypeOfExpr cmstate dflags expr
- = do (new_cmstate, names)
- <- cmRunStmt cmstate dflags ("let __cmTypeOfExpr=" ++ expr)
- case names of
- [name] -> do maybe_tystr <- cmTypeOfName new_cmstate name
- return (new_cmstate, maybe_tystr)
- _other -> pprPanic "cmTypeOfExpr" (ppr names)
+ = 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 CmState{ hit=hit, pcs=pcs, ic=ic } name
= case lookupNameEnv (ic_type_env ic) name of
Nothing -> return Nothing
- Just (AnId id) ->
- let pit = pcs_PIT pcs
- modname = moduleName (ic_module ic)
- ty = tidyType emptyTidyEnv (idType id)
- str = case lookupIfaceByModName hit pit modname of
- Nothing -> showSDoc (ppr ty)
- Just iface -> showSDocForUser unqual (ppr ty)
- where unqual = unQualInScope (mi_globals iface)
- in return (Just str)
+ 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 cmstate dflags expr
= do
let InteractiveContext {
- ic_rn_env = rn_env,
- ic_type_env = type_env,
- ic_module = this_mod } = icontext
+ 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)
+ ("let __cmCompileExpr = "++expr) False{-stmt-}
case maybe_stuff of
Nothing -> return (cmstate{ pcs=new_pcs }, Nothing)
- Just (ids, bcos) -> do
+ Just (ids, _, bcos) -> do
-- link it
hval <- linkExpr pls bcos
#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.
-cmUnload :: CmState -> IO CmState
-cmUnload state
+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{ hst=new_hst, hit=new_hit, ui=emptyUI }
- where
- CmState{ hst=hst, hit=hit } = state
- (new_hst, new_hit) = retainInTopLevelEnvs [] (hst,hit)
+
+ -- Unload everything the linker knows about
+ new_pls <- CmLink.unload mode dflags [] pls
+
+ -- 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.
-cmLoadModule :: CmState
- -> FilePath
+cmLoadModules :: CmState
+ -> DynFlags
+ -> ModuleGraph
-> IO (CmState, -- new state
Bool, -- was successful
[String]) -- list of modules loaded
-cmLoadModule cmstate1 rootname
+cmLoadModules cmstate1 dflags mg2unsorted
= do -- version 1's are the original, before downsweep
let pls1 = pls cmstate1
let pcs1 = pcs cmstate1
-- similarly, ui1 is the (complete) set of linkables from
-- 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
-- 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.
-
- dflags <- getDynFlags
let verb = verbosity dflags
- showPass dflags "Chasing dependencies"
- when (verb >= 1 && ghci_mode == Batch) $
- hPutStrLn stderr (progName ++ ": 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] mg1
- 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]
-- Sort out which linkables we wish to keep in the unlinked image.
-- See getValidLinkables below for details.
- valid_linkables <- getValidLinkables ui1 mg2unsorted_names
- mg2_with_srcimps
+ (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
-- 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. A valid linkable exists for each module in ms
+ -- 2. A valid old linkable exists for each module in ms
- stable_mods
- <- preUpsweep valid_linkables ui1 mg2unsorted_names
- [] mg2_with_srcimps
+ 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_linkables
+ valid_old_linkables
when (verb >= 2) $
putStrLn (showSDoc (text "Stable modules:"
<+> sep (map (text.moduleNameUserString) stable_mods)))
- -- unload any modules which aren't going to be re-linked this
+ -- unload any modules which are going to be re-linked this
-- time around.
- pls2 <- unload ghci_mode dflags stable_linkables pls1
+ pls2 <- CmLink.unload ghci_mode dflags stable_linkables pls1
+
+ -- 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
-- 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 hst1 hit1
+ 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 valid_linkables reachable_from
- threaded2 upsweep_these
+ threaded2 cleanup upsweep_these
let ui3 = add_to_ui valid_linkables newLis
let (CmThreaded pcs3 hst3 hit3) = threaded3
-- 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
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)
-
let mods_to_keep
- = filter ((`notElem` mods_to_zap_names).name_of_summary)
+ = 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)
-- Finish up after a cmLoad.
---
--- Empty the interactive context and set the module context to the topmost
--- newly loaded module, or the Prelude if none were loaded.
-cmLoadFinish ok linkresult hst hit ui mods ghci_mode pcs
- = do case linkresult of {
- LinkErrs _ _ -> panic "cmLoadModule: link failed (2)";
- LinkOK pls -> do
- def_mod <- readIORef defaultCurrentModule
- let current_mod = case mods of
- [] -> def_mod
- (x:_) -> ms_mod x
+-- 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, [])
- new_ic = emptyInteractiveContext current_mod
-
- new_cmstate = CmState{ hst=hst, hit=hit,
- ui=ui, mg=mods,
- gmode=ghci_mode, pcs=pcs,
- pls=pls,
- ic = new_ic }
- mods_loaded = map (moduleNameUserString.name_of_summary) mods
+-- 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 (ml_hspp_file . ms_location) 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
+
-----------------------------------------------------------------------------
--- getValidLinkables
+-- getValidLin
-- For each module (or SCC of modules), we take:
--
--- - the old in-core linkable, if available
--- - an on-disk linkable, if available
+-- - 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 take the youngest of these, provided it is younger than the
--- source file. We ignore the on-disk linkables unless all of the
--- dependents of this SCC also have on-disk linkables.
+-- 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
:: [Linkable] -- old linkables
-> [ModuleName] -- all home modules
-> [SCC ModSummary] -- all modules in the program, dependency order
- -> IO [Linkable] -- still-valid linkables
+ -> 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
-getValidLinkables old_linkables all_home_mods module_graph
- = foldM (getValidLinkablesSCC old_linkables all_home_mods) [] module_graph
getValidLinkablesSCC old_linkables all_home_mods new_linkables scc0
= let
scc = flattenSCC scc0
- scc_names = map name_of_summary scc
+ 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_allimps scc))
+ 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 new_linkables m of
- Nothing -> False
- Just l -> isObjectLinkable l
+ 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
- these_linkables
+ 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.
- adjusted_linkables
- <- if objects_allowed && not (all isObjectLinkable these_linkables)
- then foldM (getValidLinkable old_linkables False) [] scc
- else return these_linkables
+ new_linkables' <-
+ if objects_allowed
+ && not (all isObjectLinkable (map fst new_linkables'))
+ then foldM (getValidLinkable old_linkables False) [] scc
+ else return new_linkables'
- return (adjusted_linkables ++ new_linkables)
+ return (new_linkables ++ new_linkables')
-getValidLinkable :: [Linkable] -> Bool -> [Linkable] -> ModSummary
- -> IO [Linkable]
+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 = name_of_summary summary
+ = do let mod_name = modSummaryName summary
maybe_disk_linkable
- <- if (not objects_allowed)
+ <- 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
-
- -- find an old in-core linkable if we have one. (forget about
- -- on-disk linkables for now, we'll check again whether there's
- -- one here below, just in case a new one has popped up recently).
- let old_linkable = findModuleLinkable_maybe old_linkables mod_name
- maybe_old_linkable =
- case old_linkable of
- Just (LM _ _ ls) | all isInterpretable ls -> old_linkable
- _ -> Nothing
-
- -- 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 linkable_list
- = case (maybe_old_linkable, maybe_disk_linkable) of
- (Nothing, Nothing) -> []
- (Nothing, Just di) -> [di]
- (Just ui, Nothing) -> [ui]
- (Just ui, Just di)
- | linkableTime ui >= linkableTime di -> [ui]
- | otherwise -> [di]
-
- -- only linkables newer than the source code are valid
- let maybe_src_date = ms_hs_date summary
-
- valid_linkable_list
- = case maybe_src_date of
- Nothing -> panic "valid_linkable_list"
- Just src_date
- -> filter (\li -> linkableTime li > src_date) linkable_list
-
- return (valid_linkable_list ++ new_linkables)
+ 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_name obj_fn
+maybe_getFileLinkable mod obj_fn
= do obj_exist <- doesFileExist obj_fn
if not obj_exist
then return Nothing
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]))
+ 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 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
- -> [Linkable] -- old linkables
- -> [ModuleName] -- names of all mods encountered in downsweep
- -> [ModuleName] -- accumulating stable modules
+ -> [ModuleName] -- names of all mods encountered in downsweep
+ -> [ModuleName] -- accumulating stable modules
-> [SCC ModSummary] -- scc-ified mod graph, including src imps
-> IO [ModuleName] -- stable modules
-preUpsweep valid_lis old_lis all_home_mods stable []
- = return stable
-preUpsweep valid_lis old_lis all_home_mods stable (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
= 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), and the
- -- newest linkable must be the same as the previous linkable for
- -- this module (if one exists).
+ -- have a valid linkable (see getValidLinkables above).
has_valid_linkable new_summary
- = case findModuleLinkable_maybe valid_lis modname of
- Nothing -> False
- Just l -> case findModuleLinkable_maybe old_lis modname of
- Nothing -> True
- Just m -> linkableTime l == linkableTime m
- where modname = name_of_summary 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 old_lis all_home_mods
- (scc_names++stable) sccs
- else preUpsweep valid_lis old_lis all_home_mods
- stable sccs
-
- where
+ 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]
+ = [s | s <- old_summaries, modSummaryName s == mod_name]
findModInSummaries :: [ModSummary] -> Module -> Maybe ModSummary
findModInSummaries old_summaries mod
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])
-> 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, [], [])
-> [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
+ let mod_name = modSummaryName summary1
let (CmThreaded pcs1 hst1 hit1) = threaded1
let old_iface = lookupUFM hit1 mod_name
source_unchanged = isJust maybe_old_linkable
- (hst1_strictDC, hit1_strictDC)
- = retainInTopLevelEnvs
- (filter (/= (name_of_summary summary1)) reachable_from_here)
- (hst1,hit1)
+ 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, [])
+ = 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 old_linkable of
- (LM _ _ objs@(DotO _:_))
- -> do hPutStrLn stderr (showSDoc (space <>
- parens (hsep (text "using":
- punctuate comma
- [ text o | DotO o <- objs ]))))
- _ -> return ()
- else
- return ()
-
- 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
- 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.
-> do let threaded2 = CmThreaded pcs2 hst1 hit1
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)
- -> (HomeSymbolTable, HomeIfaceTable)
-retainInTopLevelEnvs keep_these (hst, hit)
+ -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
+ -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
+retainInTopLevelEnvs keep_these (hst, hit, ui)
= (retainInUFM hst keep_these,
- retainInUFM hit keep_these
+ retainInUFM hit keep_these,
+ filterModuleLinkables (`elem` keep_these) ui
)
where
retainInUFM :: Uniquable key => UniqFM elt -> [key] -> UniqFM elt
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] -> [ModSummary] -> IO ([ModSummary], Bool)
-downsweep rootNm old_summaries
- = 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 (concat (map ms_imps rootSummaries))
- (filter (isHomeModule.ms_mod) rootSummaries)
- return (all_summaries, a_root_is_Main)
+ (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
= do found <- findModule nm
case found of
Just (mod, location) -> do
let old_summary = findModInSummaries old_summaries mod
- new_summary <- summarise mod location old_summary
- case new_summary of
- Nothing -> return (fromJust old_summary)
- Just s -> return s
+ summarise mod location old_summary
- Nothing -> throwDyn (OtherError
+ Nothing -> throwDyn (CmdLineError
("can't find module `"
++ showSDoc (ppr nm) ++ "'"))
-
- -- loop invariant: home_summaries doesn't contain package modules
- loop :: [ModuleName] -> [ModSummary] -> IO [ModSummary]
- loop [] home_summaries = return home_summaries
- loop imps home_summaries
- = do -- all modules currently in homeSummaries
- let all_home = map (moduleName.ms_mod) home_summaries
- -- imports for modules we don't already have
- let needed_imps = nub (filter (`notElem` all_home) imps)
+ -- 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
- = filter (isHomeModule.ms_mod) needed_summaries
+ 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 (new_home_summaries ++ 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 timestamp.
-summarise :: Module -> ModuleLocation -> Maybe ModSummary
- -> IO (Maybe ModSummary)
+summarise :: Module -> ModuleLocation -> Maybe ModSummary
+ -> IO (Maybe ModSummary)
summarise mod location old_summary
- | isHomeModule mod
+ | not (isHomeModule mod) = return Nothing
+ | otherwise
= do let hs_fn = unJust "summarise" (ml_hs_file location)
- maybe_src_timestamp
- <- case ml_hs_file location of
- Nothing -> return Nothing
- Just src_fn -> maybe_getModificationTime src_fn
+ 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 == maybe_src_timestamp -> return Nothing;
+ 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
-
- maybe_src_timestamp
- <- case ml_hs_file location of
- Nothing -> return Nothing
- Just src_fn -> maybe_getModificationTime src_fn
+ (srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
when (mod_name /= moduleName mod) $
- throwDyn (OtherError
- (showSDoc (text "file name does not match module name: "
- <+> ppr (moduleName mod) <+> text "vs"
- <+> ppr mod_name)))
+ throwDyn (ProgramError
+ (showSDoc (text hs_fn
+ <> text ": file name does not match module name"
+ <+> quotes (ppr (moduleName mod)))))
return (Just (ModSummary mod location{ml_hspp_file=Just hspp_fn}
- srcimps imps
- maybe_src_timestamp))
+ srcimps imps src_timestamp))
}
+ }
- | otherwise
- = return (Just (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