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{-# OPTIONS_GHC -Wno-name-shadowing #-}
{-# LANGUAGE ImportQualifiedPost #-}
module Main where
import GHC.Driver.Env
import GHC.Unit.Module
import GHC.Driver.Session
import GHC.Driver.Main
import GHC
import Control.Monad
import Control.Monad.IO.Class
import System.Environment
import GHC.Unit.Module.Deps
import Data.Map.Strict qualified as Map
-- Example invocation:
-- inplace/bin/count-deps `inplace/bin/ghc-stage2 --print-libdir` "GHC.Parser"
main :: IO ()
main = do
args <- getArgs
case args of
[libdir, modName, "--dot"] -> printDeps libdir modName True
[libdir, modName] -> printDeps libdir modName False
_ -> fail "usage: count-deps libdir module [--dot]"
dotSpec :: String -> Map.Map String [String] -> String
dotSpec name g =
"digraph \"" ++ name ++ "\" {\n" ++
Map.foldlWithKey' f "" g ++ "}\n"
where
f acc k ns = acc ++ concat [" " ++ show k ++ " -> " ++ show n ++ ";\n" | n <- ns]
printDeps :: String -> String -> Bool -> IO ()
printDeps libdir modName dot = do
modGraph <-
Map.map (map moduleNameString) .
Map.mapKeys moduleNameString <$> calcDeps modName libdir
if not dot then
do
let modules = Map.keys modGraph
num = length modules
putStrLn $ "Found " ++ show num ++ " " ++ modName ++ " module dependencies"
forM_ modules putStrLn
else
-- * Copy the digraph output to a file ('deps.dot' say)
-- * To render it, use a command along the lines of
-- 'tred deps.dot > deps-tred.dot && dot -Tpdf -o deps.pdf deps-tred.dot'
putStr $ dotSpec modName modGraph
calcDeps :: String -> FilePath -> IO (Map.Map ModuleName [ModuleName])
calcDeps modName libdir =
defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
runGhc (Just libdir) $ do
df <- getSessionDynFlags
logger <- getLogger
(df, _, _) <- parseDynamicFlags logger df [noLoc "-package=ghc"]
setSessionDynFlags df
env <- getSession
loop env Map.empty [mkModuleName modName]
where
-- Source imports are only guaranteed to show up in the 'mi_deps'
-- of modules that import them directly and don’t propagate
-- transitively so we loop.
loop :: HscEnv -> Map.Map ModuleName [ModuleName] -> [ModuleName] -> Ghc (Map.Map ModuleName [ModuleName])
loop env modules (m : ms) =
if m `Map.member` modules
then loop env modules ms
else do
mi <- liftIO $ hscGetModuleInterface env (mkModule m)
let deps = modDeps mi
modules <- return $ Map.insert m [] modules
loop env (Map.insert m deps modules) $ ms ++ filter (not . (`Map.member` modules)) deps
loop _ modules [] = return modules
mkModule :: ModuleName -> Module
mkModule = Module (stringToUnit "ghc")
modDeps :: ModIface -> [ModuleName]
modDeps mi = map gwib_mod $ dep_direct_mods (mi_deps mi)
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