tools/pas2c.hs
author nemo
Sat, 10 Mar 2012 23:00:39 -0500
changeset 6764 e56ff0231540
parent 6663 2c4151afad0c
child 6816 572571ea945e
permissions -rw-r--r--
Add div to allow safe integer division from lua
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module Pas2C where
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import Text.PrettyPrint.HughesPJ
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import Data.Maybe
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import Data.Char
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import Text.Parsec.Prim hiding (State)
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import Control.Monad.State
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import System.IO
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import System.Directory
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import Control.Monad.IO.Class
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import PascalPreprocessor
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import Control.Exception
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import System.IO.Error
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import qualified Data.Map as Map
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import Data.List (find)
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import PascalParser
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import PascalUnitSyntaxTree
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data InsertOption = 
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    IOInsert
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    | IOLookup
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    | IODeferred
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type Record = (String, (String, BaseType))
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data RenderState = RenderState 
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    {
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        currentScope :: [Record],
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        lastType :: BaseType,
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        namespaces :: Map.Map String [Record]
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    }
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pas2C :: String -> IO ()
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pas2C fn = do
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    setCurrentDirectory "../hedgewars/"
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    s <- flip execStateT initState $ f fn
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    renderCFiles s
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    where
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    printLn = liftIO . hPutStrLn stderr
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    print = liftIO . hPutStr stderr
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    initState = Map.empty
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    f :: String -> StateT (Map.Map String PascalUnit) IO ()
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    f fileName = do
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        processed <- gets $ Map.member fileName
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        unless processed $ do
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            print ("Preprocessing '" ++ fileName ++ ".pas'... ")
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            fc' <- liftIO 
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                $ tryJust (guard . isDoesNotExistError) 
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                $ preprocess (fileName ++ ".pas")
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            case fc' of
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                (Left a) -> do
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                    modify (Map.insert fileName (System []))
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                    printLn "doesn't exist"
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                (Right fc) -> do
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                    print "ok, parsing... "
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                    let ptree = parse pascalUnit fileName fc
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                    case ptree of
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                         (Left a) -> do
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                            liftIO $ writeFile "preprocess.out" fc
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                            printLn $ show a ++ "\nsee preprocess.out for preprocessed source"
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                            fail "stop"
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                         (Right a) -> do
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                            printLn "ok"
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                            modify (Map.insert fileName a)
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                            mapM_ f (usesFiles a)
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renderCFiles :: Map.Map String PascalUnit -> IO ()
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renderCFiles units = do
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    let u = Map.toList units
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    let nss = Map.map (toNamespace nss) units
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    mapM_ (toCFiles nss) u
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    where
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    toNamespace :: Map.Map String [Record] -> PascalUnit -> [Record]
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    toNamespace nss (System tvs) = 
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        currentScope $ execState (mapM_ (tvar2C True) tvs) (RenderState [] BTUnknown nss)
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    toNamespace _ (Program {}) = []
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    toNamespace nss (Unit _ interface _ _ _) = 
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        currentScope $ execState (interface2C interface) (RenderState [] BTUnknown nss)
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toCFiles :: Map.Map String [Record] -> (String, PascalUnit) -> IO ()
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toCFiles _ (_, System _) = return ()
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toCFiles ns p@(fn, pu) = do
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    hPutStrLn stderr $ "Rendering '" ++ fn ++ "'..."
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    toCFiles' p
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    where
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    toCFiles' (fn, p@(Program {})) = writeFile (fn ++ ".c") $ (render2C initialState . pascal2C) p
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    toCFiles' (fn, (Unit _ interface implementation _ _)) = do
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        let (a, s) = runState (interface2C interface) initialState
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        writeFile (fn ++ ".h") $ "#pragma once\n" ++ (render a)
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        writeFile (fn ++ ".c") $ (render2C s . implementation2C) implementation
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    initialState = RenderState [] BTUnknown ns
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    render2C :: RenderState -> State RenderState Doc -> String
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    render2C a = render . flip evalState a
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usesFiles :: PascalUnit -> [String]
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usesFiles (Program _ (Implementation uses _) _) = "pas2cSystem" : uses2List uses
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usesFiles (Unit _ (Interface uses1 _) (Implementation uses2 _) _ _) = "pas2cSystem" : uses2List uses1 ++ uses2List uses2
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usesFiles (System {}) = []
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pascal2C :: PascalUnit -> State RenderState Doc
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pascal2C (Unit _ interface implementation init fin) =
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    liftM2 ($+$) (interface2C interface) (implementation2C implementation)
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pascal2C (Program _ implementation mainFunction) = do
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    impl <- implementation2C implementation
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    main <- tvar2C True 
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        (FunctionDeclaration (Identifier "main" BTInt) (SimpleType $ Identifier "int" BTInt) [] (Just (TypesAndVars [], mainFunction)))
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    return $ impl $+$ main
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interface2C :: Interface -> State RenderState Doc
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interface2C (Interface uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
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implementation2C :: Implementation -> State RenderState Doc
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implementation2C (Implementation uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
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typesAndVars2C :: Bool -> TypesAndVars -> State RenderState Doc
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typesAndVars2C b (TypesAndVars ts) = liftM vcat $ mapM (tvar2C b) ts
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uses2C :: Uses -> State RenderState Doc
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uses2C uses@(Uses unitIds) = do
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    mapM_ injectNamespace (Identifier "pas2cSystem" undefined : unitIds)
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    mapM_ (id2C IOInsert) unitIds
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    return $ vcat . map (\i -> text $ "#include \"" ++ i ++ ".h\"") $ uses2List uses
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    where
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    injectNamespace (Identifier i _) = do
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        getNS <- gets (flip Map.lookup . namespaces)
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        let f = flip (foldl (\a b -> b:a)) (fromMaybe [] (getNS i))
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        modify (\s -> s{currentScope = f $ currentScope s})
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uses2List :: Uses -> [String]
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uses2List (Uses ids) = map (\(Identifier i _) -> i) ids
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id2C :: InsertOption -> Identifier -> State RenderState Doc
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id2C IOInsert (Identifier i t) = do
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    modify (\s -> s{currentScope = (map toLower i, (i, t)) : currentScope s})
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    return $ text i
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id2C IOLookup (Identifier i t) = do
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    let i' = map toLower i
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    v <- gets $ find (\(a, _) -> a == i') . currentScope
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    ns <- gets currentScope
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    modify (\s -> s{lastType = t})
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    if isNothing v then 
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        error $ "Not defined: '" ++ i' ++ "'\n" -- ++ show ns
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        else 
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        return . text . fst . snd . fromJust $ v
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id2C IODeferred (Identifier i t) = do
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    let i' = map toLower i
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    v <- gets $ find (\(a, _) -> a == i') . currentScope
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    if (isNothing v) then
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        do
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        modify (\s -> s{currentScope = (i', (i, t)) : currentScope s})
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        return $ text i
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        else
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        return . text . fst . snd . fromJust $ v
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id2CTyped :: TypeDecl -> Identifier -> State RenderState Doc
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id2CTyped t (Identifier i _) = do
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    tb <- resolveType t
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    case tb of 
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        BTUnknown -> do
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            ns <- gets currentScope
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            error $ "id2CTyped: type BTUnknown for " ++ show i ++ "\ntype: " ++ show t ++ "\nnamespace: " ++ show ns
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        _ -> id2C IOInsert (Identifier i tb)
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resolveType :: TypeDecl -> State RenderState BaseType
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resolveType st@(SimpleType (Identifier i _)) = do
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    let i' = map toLower i
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    v <- gets $ find (\(a, _) -> a == i') . currentScope
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    if isJust v then return . snd . snd $ fromJust v else return $ f i'
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    where
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    f "integer" = BTInt
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    f "pointer" = BTPointerTo BTVoid
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    f "boolean" = BTBool
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    f "float" = BTFloat
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    f "char" = BTChar
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    f "string" = BTString
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    f _ = error $ "Unknown system type: " ++ show st
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resolveType (PointerTo t) = return $ BTPointerTo BTUnknown  -- can't resolveType for t here
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resolveType (RecordType tv mtvs) = do
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    tvs <- mapM f (concat $ tv : fromMaybe [] mtvs)
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    return . BTRecord . concat $ tvs
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    where
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        f :: TypeVarDeclaration -> State RenderState [(String, BaseType)]
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        f (VarDeclaration _ (ids, td) _) = mapM (\(Identifier i _) -> liftM ((,) i) $ resolveType td) ids
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resolveType (ArrayDecl (Just _) t) = liftM (BTArray BTInt) $ resolveType t
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resolveType (ArrayDecl Nothing t) = liftM (BTArray BTInt) $ resolveType t
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resolveType (FunctionType _ _) = return BTFunction
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resolveType (DeriveType _) = return BTInt
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resolveType (String _) = return BTString
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resolveType (Sequence ids) = return $ BTEnum $ map (\(Identifier i _) -> map toLower i) ids
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resolveType (RangeType _) = return $ BTInt
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resolveType (Set t) = liftM BTSet $ resolveType t
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--resolveType UnknownType = return BTUnknown    
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resolveType a = error $ "resolveType: " ++ show a
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tvar2C :: Bool -> TypeVarDeclaration -> State RenderState Doc
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tvar2C _ (FunctionDeclaration name returnType params Nothing) = do
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    t <- type2C returnType 
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    p <- liftM hcat $ mapM (tvar2C False) params
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    n <- id2C IOInsert name
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    return $ t <+> n <> parens p <> text ";"
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tvar2C True (FunctionDeclaration name returnType params (Just (tvars, phrase))) = do
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    t <- type2C returnType 
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    p <- liftM hcat $ mapM (tvar2C False) params
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    ph <- liftM2 ($+$) (typesAndVars2C False tvars) (phrase2C' phrase)
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    n <- id2C IOInsert name
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    return $ 
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        t <+> n <> parens p
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        $+$
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        text "{" 
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        $+$ 
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        nest 4 ph
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        $+$
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        text "}"
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    where
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    phrase2C' (Phrases p) = liftM vcat $ mapM phrase2C p
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    phrase2C' p = phrase2C p
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tvar2C False (FunctionDeclaration (Identifier name _) _ _ _) = error $ "nested functions not allowed: " ++ name
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tvar2C _ td@(TypeDeclaration i' t) = do
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    i <- id2CTyped t i'
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    tp <- type2C t
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    return $ text "type" <+> i <+> tp <> text ";"
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tvar2C _ (VarDeclaration isConst (ids, t) mInitExpr) = do
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    t' <- type2C t
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    i <- mapM (id2CTyped t) ids
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   241
    ie <- initExpr mInitExpr
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   242
    return $ if isConst then text "const" else empty
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   243
        <+> t'
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   244
        <+> (hsep . punctuate (char ',') $ i)
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        <+> ie
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        <> text ";"
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    where
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    initExpr Nothing = return $ empty
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    initExpr (Just e) = liftM (text "=" <+>) (initExpr2C e)
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   250
    
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tvar2C f (OperatorDeclaration op _ ret params body) = 
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    tvar2C f (FunctionDeclaration (Identifier ("<op " ++ op ++ ">") BTUnknown) ret params body)
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initExpr2C :: InitExpression -> State RenderState Doc
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initExpr2C (InitBinOp op expr1 expr2) = do
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    e1 <- initExpr2C expr1
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    e2 <- initExpr2C expr2
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    o <- op2C op
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    return $ parens $ e1 <+> o <+> e2
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initExpr2C (InitNumber s) = return $ text s
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initExpr2C (InitFloat s) = return $ text s
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initExpr2C (InitHexNumber s) = return $ text "0x" <> (text . map toLower $ s)
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initExpr2C (InitString s) = return $ doubleQuotes $ text s 
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initExpr2C (InitReference i) = id2C IOLookup i
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initExpr2C _ = return $ text "<<expression>>"
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type2C :: TypeDecl -> State RenderState Doc
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type2C UnknownType = return $ text "void"
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type2C (String l) = return $ text $ "string" ++ show l
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type2C (SimpleType i) = id2C IOLookup i
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type2C (PointerTo (SimpleType i)) = liftM (<> text "*") $ id2C IODeferred i
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type2C (PointerTo t) = liftM (<> text "*") $ type2C t
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type2C (RecordType tvs union) = do
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    t <- mapM (tvar2C False) tvs
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    return $ text "{" $+$ (nest 4 . vcat $ t) $+$ text "}"
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type2C (RangeType r) = return $ text "<<range type>>"
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type2C (Sequence ids) = do
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    mapM_ (id2C IOInsert) ids
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    return $ text "<<sequence type>>"
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type2C (ArrayDecl r t) = return $ text "<<array type>>"
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type2C (Set t) = return $ text "<<set>>"
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type2C (FunctionType returnType params) = return $ text "<<function>>"
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type2C (DeriveType _) = return $ text "<<type derived from constant literal>>"
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phrase2C :: Phrase -> State RenderState Doc
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phrase2C (Phrases p) = do
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   289
    ps <- mapM phrase2C p
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   290
    return $ text "{" $+$ (nest 4 . vcat $ ps) $+$ text "}"
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   291
phrase2C (ProcCall f@(FunCall {}) []) = liftM (<> semi) $ ref2C f
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   292
phrase2C (ProcCall ref params) = do
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   293
    r <- ref2C ref
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   294
    ps <- mapM expr2C params
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   295
    return $ r <> parens (hsep . punctuate (char ',') $ ps) <> semi
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   296
phrase2C (IfThenElse (expr) phrase1 mphrase2) = do
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   297
    e <- expr2C expr
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   298
    p1 <- (phrase2C . wrapPhrase) phrase1
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   299
    el <- elsePart
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   300
    return $ 
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   301
        text "if" <> parens e $+$ p1 $+$ el
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   302
    where
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   303
    elsePart | isNothing mphrase2 = return $ empty
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   304
             | otherwise = liftM (text "else" $$) $ (phrase2C . wrapPhrase) (fromJust mphrase2)
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   305
phrase2C (Assignment ref expr) = do
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   306
    r <- ref2C ref 
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   307
    e <- expr2C expr
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   308
    return $
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   309
        r <> text " = " <> e <> semi
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   310
phrase2C (WhileCycle expr phrase) = do
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   311
    e <- expr2C expr
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   312
    p <- phrase2C $ wrapPhrase phrase
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   313
    return $ text "while" <> parens e $$ p
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   314
phrase2C (SwitchCase expr cases mphrase) = do
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   315
    e <- expr2C expr
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   316
    cs <- mapM case2C cases
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   317
    return $ 
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   318
        text "switch" <> parens e <> text "of" $+$ (nest 4 . vcat) cs
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   319
    where
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   320
    case2C :: ([InitExpression], Phrase) -> State RenderState Doc
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   321
    case2C (e, p) = do
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   322
        ie <- mapM initExpr2C e
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   323
        ph <- phrase2C p
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   324
        return $ 
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   325
            text "case" <+> parens (hsep . punctuate (char ',') $ ie) <> char ':' <> nest 4 (ph $+$ text "break;")
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   326
phrase2C (WithBlock ref p) = do
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   327
    r <- ref2C ref 
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   328
    ph <- phrase2C $ wrapPhrase p
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   329
    return $ text "namespace" <> parens r $$ ph
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   330
phrase2C (ForCycle i' e1' e2' p) = do
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   331
    i <- id2C IOLookup i'
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   332
    e1 <- expr2C e1'
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   333
    e2 <- expr2C e2'
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   334
    ph <- phrase2C (wrapPhrase p)
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   335
    return $ 
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   336
        text "for" <> (parens . hsep . punctuate (char ';') $ [i <+> text "=" <+> e1, i <+> text "<=" <+> e2, text "++" <> i])
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   337
        $$
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   338
        ph
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   339
phrase2C (RepeatCycle e' p') = do
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   340
    e <- expr2C e'
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   341
    p <- phrase2C (Phrases p')
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   342
    return $ text "do" <+> p <+> text "while" <> parens (text "!" <> parens e)
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   343
phrase2C NOP = return $ text ";"
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734fed7aefd3 Introduce initialization expressions
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   344
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   345
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   346
wrapPhrase p@(Phrases _) = p
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   347
wrapPhrase p = Phrases [p]
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   348
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734fed7aefd3 Introduce initialization expressions
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   349
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   350
expr2C :: Expression -> State RenderState Doc
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   351
expr2C (Expression s) = return $ text s
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   352
expr2C (BinOp op expr1 expr2) = do
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   353
    e1 <- expr2C expr1
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   354
    e2 <- expr2C expr2
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   355
    o <- op2C op
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   356
    return $ parens $ e1 <+> o <+> e2
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   357
expr2C (NumberLiteral s) = return $ text s
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   358
expr2C (FloatLiteral s) = return $ text s
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   359
expr2C (HexNumber s) = return $ text "0x" <> (text . map toLower $ s)
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   360
expr2C (StringLiteral s) = return $ doubleQuotes $ text s 
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627b5752733a A try to improve parser move (has regressions)
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   361
expr2C (Reference ref) = ref2C ref
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   362
expr2C (PrefixOp op expr) = liftM2 (<+>) (op2C op) (expr2C expr)
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   363
expr2C Null = return $ text "NULL"
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   364
expr2C (BuiltInFunCall params ref) = do
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   365
    r <- ref2C ref 
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   366
    ps <- mapM expr2C params
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diff changeset
   367
    return $ 
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   368
        r <> parens (hsep . punctuate (char ',') $ ps)
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   369
expr2C _ = return $ text "<<expression>>"
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   370
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diff changeset
   371
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   372
ref2C :: Reference -> State RenderState Doc
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   373
ref2C (ArrayElement exprs ref) = do
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   374
    r <- ref2C ref 
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   375
    es <- mapM expr2C exprs
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   376
    return $ r <> (brackets . hcat) (punctuate comma es)
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2c4151afad0c Workaround pointers to not yet defined types
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   377
ref2C (SimpleReference name) = id2C IOLookup name
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   378
ref2C (RecordField (Dereference ref1) ref2) = do
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   379
    r1 <- ref2C ref1 
648caa66991b Convert into Reader monad
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   380
    r2 <- ref2C ref2
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diff changeset
   381
    return $ 
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   382
        r1 <> text "->" <> r2
6618
2d3232069c4b Propagate types on identifiers
unc0rr
parents: 6552
diff changeset
   383
ref2C rf@(RecordField ref1 ref2) = do
2d3232069c4b Propagate types on identifiers
unc0rr
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diff changeset
   384
    r1 <- ref2C ref1
2d3232069c4b Propagate types on identifiers
unc0rr
parents: 6552
diff changeset
   385
    t <- gets lastType
2d3232069c4b Propagate types on identifiers
unc0rr
parents: 6552
diff changeset
   386
    case t of
2d3232069c4b Propagate types on identifiers
unc0rr
parents: 6552
diff changeset
   387
        r@(BTRecord _) -> error $ show r
2d3232069c4b Propagate types on identifiers
unc0rr
parents: 6552
diff changeset
   388
        a -> error $ "dereferencing from " ++ show a ++ " - " ++ show rf
6509
648caa66991b Convert into Reader monad
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diff changeset
   389
    r2 <- ref2C ref2
648caa66991b Convert into Reader monad
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diff changeset
   390
    return $ 
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   391
        r1 <> text "." <> r2
648caa66991b Convert into Reader monad
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diff changeset
   392
ref2C (Dereference ref) = liftM ((parens $ text "*") <>) $ ref2C ref
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   393
ref2C (FunCall params ref) = do
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   394
    r <- ref2C ref
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   395
    ps <- mapM expr2C params
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   396
    return $ 
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   397
        r <> parens (hsep . punctuate (char ',') $ ps)
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   398
ref2C (Address ref) = do
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   399
    r <- ref2C ref
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   400
    return $ text "&" <> parens r
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   401
ref2C (TypeCast t' expr) = do
6663
2c4151afad0c Workaround pointers to not yet defined types
unc0rr
parents: 6653
diff changeset
   402
    t <- id2C IOLookup t'
6509
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   403
    e <- expr2C expr
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   404
    return $ parens t <> e
6467
090269e528df - Improve parsing of prefix operators
unc0rr
parents: 6455
diff changeset
   405
ref2C (RefExpression expr) = expr2C expr
6355
734fed7aefd3 Introduce initialization expressions
unc0rr
parents: 6317
diff changeset
   406
6509
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   407
6512
0df7f6697939 "System" unit to help converter
unc0rr
parents: 6511
diff changeset
   408
op2C :: String -> State RenderState Doc
6509
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   409
op2C "or" = return $ text "|"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   410
op2C "and" = return $ text "&"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   411
op2C "not" = return $ text "!"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   412
op2C "xor" = return $ text "^"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   413
op2C "div" = return $ text "/"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   414
op2C "mod" = return $ text "%"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   415
op2C "shl" = return $ text "<<"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   416
op2C "shr" = return $ text ">>"
648caa66991b Convert into Reader monad
unc0rr
parents: 6499
diff changeset
   417
op2C "<>" = return $ text "!="
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   418
op2C "=" = return $ text "=="
648caa66991b Convert into Reader monad
unc0rr
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diff changeset
   419
op2C a = return $ text a
6273
13262c6e5027 Starting pas2C using library called 'pretty'
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parents:
diff changeset
   420
13262c6e5027 Starting pas2C using library called 'pretty'
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parents:
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   421
maybeVoid "" = "void"
13262c6e5027 Starting pas2C using library called 'pretty'
unc0rr
parents:
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   422
maybeVoid a = a