152 lines
4.6 KiB
Haskell
152 lines
4.6 KiB
Haskell
{-# LANGUAGE CPP, BangPatterns #-}
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module Language.Haskell.GhcMod.Find
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#ifndef SPEC
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(
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Symbol
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, SymbolDb
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, loadSymbolDb
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, lookupSymbol
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, dumpSymbol
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, findSymbol
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, lookupSym
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, isOutdated
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)
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#endif
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where
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import Control.Applicative ((<$>))
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import Control.Monad (when, void)
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import Data.Function (on)
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import Data.List (groupBy, sort)
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import Data.Maybe (fromMaybe)
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import qualified GHC as G
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import Language.Haskell.GhcMod.Convert
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import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils
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import Language.Haskell.GhcMod.PathsAndFiles
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import Language.Haskell.GhcMod.Gap (listVisibleModules)
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import Name (getOccString)
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import Module (moduleName)
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import System.Directory (doesFileExist, getModificationTime)
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import System.FilePath ((</>), takeDirectory)
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import System.IO
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#ifndef MIN_VERSION_containers
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#define MIN_VERSION_containers(x,y,z) 1
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#endif
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#if MIN_VERSION_containers(0,5,0)
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import Data.Map (Map)
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import qualified Data.Map as M
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#else
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import Data.Map (Map)
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import qualified Data.Map as M
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#endif
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----------------------------------------------------------------
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-- | Type of function and operation names.
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type Symbol = String
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-- | Database from 'Symbol' to \['ModuleString'\].
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data SymbolDb = SymbolDb {
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table :: Map Symbol [ModuleString]
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, packageCachePath :: FilePath
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, symbolDbCachePath :: FilePath
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} deriving (Show)
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isOutdated :: SymbolDb -> IO Bool
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isOutdated db = symbolDbCachePath db `isOlderThan` packageCachePath db
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----------------------------------------------------------------
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-- | Looking up 'SymbolDb' with 'Symbol' to \['ModuleString'\]
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-- which will be concatenated. 'loadSymbolDb' is called internally.
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findSymbol :: IOish m => Symbol -> GhcModT m String
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findSymbol sym = loadSymbolDb >>= lookupSymbol sym
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-- | Looking up 'SymbolDb' with 'Symbol' to \['ModuleString'\]
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-- which will be concatenated.
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lookupSymbol :: IOish m => Symbol -> SymbolDb -> GhcModT m String
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lookupSymbol sym db = convert' $ lookupSym sym db
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lookupSym :: Symbol -> SymbolDb -> [ModuleString]
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lookupSym sym db = fromMaybe [] $ M.lookup sym $ table db
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---------------------------------------------------------------
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-- | Loading a file and creates 'SymbolDb'.
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loadSymbolDb :: IOish m => GhcModT m SymbolDb
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loadSymbolDb = do
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ghcMod <- liftIO ghcModExecutable
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tmpdir <- cradleTempDir <$> cradle
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file <- liftIO $ chop <$> readProcess ghcMod ["dumpsym", tmpdir] ""
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!db <- M.fromAscList . map conv . lines <$> liftIO (readFile file)
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return $ SymbolDb {
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table = db
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, packageCachePath = takeDirectory file </> packageCache
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, symbolDbCachePath = file
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}
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where
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conv :: String -> (Symbol,[ModuleString])
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conv = read
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chop "" = ""
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chop xs = init xs
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----------------------------------------------------------------
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-- used 'ghc-mod dumpsym'
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-- | Dumping a set of ('Symbol',\['ModuleString'\]) to a file
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-- if the file does not exist or is invalid.
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-- The file name is printed.
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dumpSymbol :: IOish m => FilePath -> GhcModT m String
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dumpSymbol dir = runGmPkgGhc $ do
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let cache = dir </> symbolCacheFile
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pkgdb = dir </> packageCache
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create <- liftIO $ cache `isOlderThan` pkgdb
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when create $ (liftIO . writeSymbolCache cache) =<< getGlobalSymbolTable
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return $ unlines [cache]
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writeSymbolCache :: FilePath
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-> [(Symbol,[ModuleString])]
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-> IO ()
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writeSymbolCache cache sm =
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void . withFile cache WriteMode $ \hdl ->
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mapM (hPrint hdl) sm
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isOlderThan :: FilePath -> FilePath -> IO Bool
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isOlderThan cache file = do
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exist <- doesFileExist cache
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if not exist then
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return True
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else do
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tCache <- getModificationTime cache
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tFile <- getModificationTime file
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return $ tCache <= tFile -- including equal just in case
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-- | Browsing all functions in all system modules.
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getGlobalSymbolTable :: LightGhc [(Symbol,[ModuleString])]
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getGlobalSymbolTable = do
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df <- G.getSessionDynFlags
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let mods = listVisibleModules df
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moduleInfos <- mapM G.getModuleInfo mods
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return $ collectModules
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$ extractBindings `concatMap` (moduleInfos `zip` mods)
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extractBindings :: (Maybe G.ModuleInfo, G.Module)
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-> [(Symbol, ModuleString)]
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extractBindings (Nothing,_) = []
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extractBindings (Just inf,mdl) =
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map (\name -> (getOccString name, moduleNameString $ moduleName mdl)) names
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where
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names = G.modInfoExports inf
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collectModules :: [(Symbol,ModuleString)]
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-> [(Symbol,[ModuleString])]
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collectModules = map tieup . groupBy ((==) `on` fst) . sort
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where
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tieup x = (head (map fst x), map snd x)
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