X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=597253ee01aec6a62143d03f6c6821b58be99c42;hp=48eda2245249c82ef151aedce3e48da26ac2d157;hb=2fe38b5fb0957f9428864afd69ad3ccd82fae3d0;hpb=190f24892156953d73b55401d0467a6f1a88ce5d diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs index 48eda22..597253e 100644 --- a/compiler/main/HeaderInfo.hs +++ b/compiler/main/HeaderInfo.hs @@ -1,6 +1,6 @@ ----------------------------------------------------------------------------- -- --- Parsing the top of a Haskell source file to get its module name, +-- | Parsing the top of a Haskell source file to get its module name, -- imports and options. -- -- (c) Simon Marlow 2005 @@ -8,188 +8,249 @@ -- ----------------------------------------------------------------------------- -module HeaderInfo ( getImportsFromFile, getImports +module HeaderInfo ( getImports , getOptionsFromFile, getOptions - , optionsErrorMsgs ) where + , optionsErrorMsgs, + checkProcessArgsResult ) where #include "HsVersions.h" +import RdrName +import HscTypes import Parser ( parseHeader ) -import Lexer ( P(..), ParseResult(..), mkPState, pragState - , lexer, Token(..), PState(..) ) +import Lexer import FastString import HsSyn ( ImportDecl(..), HsModule(..) ) import Module ( ModuleName, moduleName ) import PrelNames ( gHC_PRIM, mAIN_NAME ) -import StringBuffer ( StringBuffer(..), hGetStringBuffer, hGetStringBufferBlock - , appendStringBuffers ) -import SrcLoc ( Located(..), mkSrcLoc, unLoc, noSrcSpan ) -import FastString ( mkFastString ) -import DynFlags ( DynFlags ) +import StringBuffer +import SrcLoc +import DynFlags import ErrUtils import Util import Outputable import Pretty () -import Panic -import Bag ( emptyBag, listToBag ) - -import Distribution.Compiler - -import EXCEPTION ( throwDyn ) -import IO -import List - -#if __GLASGOW_HASKELL__ >= 601 -import System.IO ( openBinaryFile ) -#else -import IOExts ( openFileEx, IOModeEx(..) ) -#endif - -#if __GLASGOW_HASKELL__ < 601 -openBinaryFile fp mode = openFileEx fp (BinaryMode mode) -#endif - --- getImportsFromFile is careful to close the file afterwards, otherwise --- we can end up with a large number of open handles before the garbage --- collector gets around to closing them. -getImportsFromFile :: DynFlags -> FilePath - -> IO ([Located ModuleName], [Located ModuleName], Located ModuleName) -getImportsFromFile dflags filename = do - buf <- hGetStringBuffer filename - getImports dflags buf filename - -getImports :: DynFlags -> StringBuffer -> FilePath - -> IO ([Located ModuleName], [Located ModuleName], Located ModuleName) -getImports dflags buf filename = do - let loc = mkSrcLoc (mkFastString filename) 1 0 +import Maybes +import Bag ( emptyBag, listToBag, unitBag ) + +import MonadUtils ( MonadIO ) +import Exception +import Control.Monad +import System.IO +import System.IO.Unsafe +import Data.List + +------------------------------------------------------------------------------ + +-- | Parse the imports of a source file. +-- +-- Throws a 'SourceError' if parsing fails. +getImports :: GhcMonad m => + DynFlags + -> StringBuffer -- ^ Parse this. + -> FilePath -- ^ Filename the buffer came from. Used for + -- reporting parse error locations. + -> FilePath -- ^ The original source filename (used for locations + -- in the function result) + -> m ([Located (ImportDecl RdrName)], [Located (ImportDecl RdrName)], Located ModuleName) + -- ^ The source imports, normal imports, and the module name. +getImports dflags buf filename source_filename = do + let loc = mkSrcLoc (mkFastString filename) 1 1 case unP parseHeader (mkPState buf loc dflags) of - PFailed span err -> parseError span err - POk _ rdr_module -> + PFailed span err -> parseError span err + POk pst rdr_module -> do + let _ms@(_warns, errs) = getMessages pst + -- don't log warnings: they'll be reported when we parse the file + -- for real. See #2500. + ms = (emptyBag, errs) + -- logWarnings warns + if errorsFound dflags ms + then liftIO $ throwIO $ mkSrcErr errs + else case rdr_module of - L _ (HsModule mod _ imps _ _ _ _ _) -> + L _ (HsModule mb_mod _ imps _ _ _) -> let - mod_name | Just located_mod <- mod = located_mod - | otherwise = L noSrcSpan mAIN_NAME - (src_idecls, ord_idecls) = partition isSourceIdecl (map unLoc imps) - source_imps = map getImpMod src_idecls - ordinary_imps = filter ((/= moduleName gHC_PRIM) . unLoc) - (map getImpMod ord_idecls) + main_loc = mkSrcLoc (mkFastString source_filename) 1 1 + mod = mb_mod `orElse` L (srcLocSpan main_loc) mAIN_NAME + (src_idecls, ord_idecls) = partition (ideclSource.unLoc) imps + ordinary_imps = filter ((/= moduleName gHC_PRIM) . unLoc . ideclName . unLoc) + ord_idecls -- GHC.Prim doesn't exist physically, so don't go looking for it. in - return (source_imps, ordinary_imps, mod_name) + return (src_idecls, ordinary_imps, mod) -parseError span err = throwDyn $ mkPlainErrMsg span err - -isSourceIdecl (ImportDecl _ s _ _ _) = s - -getImpMod (ImportDecl located_mod _ _ _ _) = located_mod +parseError :: GhcMonad m => SrcSpan -> Message -> m a +parseError span err = throwOneError $ mkPlainErrMsg span err -------------------------------------------------------------- -- Get options -------------------------------------------------------------- - -getOptionsFromFile :: FilePath -- input file - -> IO [Located String] -- options, if any -getOptionsFromFile filename - = bracket (openBinaryFile filename ReadMode) +-- | Parse OPTIONS and LANGUAGE pragmas of the source file. +-- +-- Throws a 'SourceError' if flag parsing fails (including unsupported flags.) +getOptionsFromFile :: DynFlags + -> FilePath -- ^ Input file + -> IO [Located String] -- ^ Parsed options, if any. +getOptionsFromFile dflags filename + = Exception.bracket + (openBinaryFile filename ReadMode) (hClose) - (\handle -> - do buf <- hGetStringBufferBlock handle blockSize - loop handle buf) - where blockSize = 1024 - loop handle buf - | len buf == 0 = return [] - | otherwise - = case getOptions' buf filename of - (Nothing, opts) -> return opts - (Just buf', opts) -> do nextBlock <- hGetStringBufferBlock handle blockSize - newBuf <- appendStringBuffers buf' nextBlock - if len newBuf == len buf - then return opts - else do opts' <- loop handle newBuf - return (opts++opts') - -getOptions :: StringBuffer -> FilePath -> [Located String] -getOptions buf filename - = case getOptions' buf filename of - (_,opts) -> opts + (\handle -> do + opts <- fmap getOptions' $ lazyGetToks dflags filename handle + seqList opts $ return opts) + +blockSize :: Int +-- blockSize = 17 -- for testing :-) +blockSize = 1024 + +lazyGetToks :: DynFlags -> FilePath -> Handle -> IO [Located Token] +lazyGetToks dflags filename handle = do + buf <- hGetStringBufferBlock handle blockSize + unsafeInterleaveIO $ lazyLexBuf handle (pragState dflags buf loc) False + where + loc = mkSrcLoc (mkFastString filename) 1 1 + + lazyLexBuf :: Handle -> PState -> Bool -> IO [Located Token] + lazyLexBuf handle state eof = do + case unP (lexer return) state of + POk state' t -> do + -- pprTrace "lazyLexBuf" (text (show (buffer state'))) (return ()) + if atEnd (buffer state') && not eof + -- if this token reached the end of the buffer, and we haven't + -- necessarily read up to the end of the file, then the token might + -- be truncated, so read some more of the file and lex it again. + then getMore handle state + else case t of + L _ ITeof -> return [t] + _other -> do rest <- lazyLexBuf handle state' eof + return (t : rest) + _ | not eof -> getMore handle state + | otherwise -> return [L (last_loc state) ITeof] + -- parser assumes an ITeof sentinel at the end + + getMore :: Handle -> PState -> IO [Located Token] + getMore handle state = do + -- pprTrace "getMore" (text (show (buffer state))) (return ()) + nextbuf <- hGetStringBufferBlock handle blockSize + if (len nextbuf == 0) then lazyLexBuf handle state True else do + newbuf <- appendStringBuffers (buffer state) nextbuf + unsafeInterleaveIO $ lazyLexBuf handle state{buffer=newbuf} False + + +getToks :: DynFlags -> FilePath -> StringBuffer -> [Located Token] +getToks dflags filename buf = lexAll (pragState dflags buf loc) + where + loc = mkSrcLoc (mkFastString filename) 1 1 + + lexAll state = case unP (lexer return) state of + POk _ t@(L _ ITeof) -> [t] + POk state' t -> t : lexAll state' + _ -> [L (last_loc state) ITeof] + + +-- | Parse OPTIONS and LANGUAGE pragmas of the source file. +-- +-- Throws a 'SourceError' if flag parsing fails (including unsupported flags.) +getOptions :: DynFlags + -> StringBuffer -- ^ Input Buffer + -> FilePath -- ^ Source filename. Used for location info. + -> [Located String] -- ^ Parsed options. +getOptions dflags buf filename + = getOptions' (getToks dflags filename buf) -- The token parser is written manually because Happy can't -- return a partial result when it encounters a lexer error. -- We want to extract options before the buffer is passed through -- CPP, so we can't use the same trick as 'getImports'. -getOptions' :: StringBuffer -- Input buffer - -> FilePath -- Source file. Used for msgs only. - -> ( Maybe StringBuffer -- Just => we can use more input - , [Located String] -- Options. - ) -getOptions' buf filename - = parseToks (lexAll (pragState buf loc)) - where loc = mkSrcLoc (mkFastString filename) 1 0 - - getToken (buf,L _loc tok) = tok - getLoc (buf,L loc _tok) = loc - getBuf (buf,_tok) = buf - combine opts (flag, opts') = (flag, opts++opts') - add opt (flag, opts) = (flag, opt:opts) +getOptions' :: [Located Token] -- Input buffer + -> [Located String] -- Options. +getOptions' toks + = parseToks toks + where + getToken (L _loc tok) = tok + getLoc (L loc _tok) = loc parseToks (open:close:xs) | IToptions_prag str <- getToken open , ITclose_prag <- getToken close - = map (L (getLoc open)) (words str) `combine` + = map (L (getLoc open)) (words str) ++ parseToks xs parseToks (open:close:xs) | ITinclude_prag str <- getToken open , ITclose_prag <- getToken close - = map (L (getLoc open)) ["-#include",removeSpaces str] `combine` + = map (L (getLoc open)) ["-#include",removeSpaces str] ++ parseToks xs + parseToks (open:close:xs) + | ITdocOptions str <- getToken open + , ITclose_prag <- getToken close + = map (L (getLoc open)) ["-haddock-opts", removeSpaces str] + ++ parseToks xs + parseToks (open:xs) + | ITdocOptionsOld str <- getToken open + = map (L (getLoc open)) ["-haddock-opts", removeSpaces str] + ++ parseToks xs parseToks (open:xs) | ITlanguage_prag <- getToken open = parseLanguage xs - -- The last token before EOF could have been truncated. - -- We ignore it to be on the safe side. - parseToks [tok,eof] - | ITeof <- getToken eof - = (Just (getBuf tok),[]) - parseToks (eof:_) - | ITeof <- getToken eof - = (Just (getBuf eof),[]) - parseToks _ = (Nothing,[]) - parseLanguage ((_buf,L loc (ITconid fs)):rest) - = checkExtension (L loc fs) `add` + parseToks _ = [] + parseLanguage (L loc (ITconid fs):rest) + = checkExtension (L loc fs) : case rest of - (_,L loc ITcomma):more -> parseLanguage more - (_,L loc ITclose_prag):more -> parseToks more - (_,L loc _):_ -> languagePragParseError loc + (L _loc ITcomma):more -> parseLanguage more + (L _loc ITclose_prag):more -> parseToks more + (L loc _):_ -> languagePragParseError loc + [] -> panic "getOptions'.parseLanguage(1) went past eof token" parseLanguage (tok:_) = languagePragParseError (getLoc tok) - lexToken t = return t - lexAll state = case unP (lexer lexToken) state of - POk state' t@(L _ ITeof) -> [(buffer state,t)] - POk state' t -> (buffer state,t):lexAll state' - _ -> [(buffer state,L (last_loc state) ITeof)] + parseLanguage [] + = panic "getOptions'.parseLanguage(2) went past eof token" + +----------------------------------------------------------------------------- + +-- | Complain about non-dynamic flags in OPTIONS pragmas. +-- +-- Throws a 'SourceError' if the input list is non-empty claiming that the +-- input flags are unknown. +checkProcessArgsResult :: MonadIO m => [Located String] -> m () +checkProcessArgsResult flags + = when (notNull flags) $ + liftIO $ throwIO $ mkSrcErr $ listToBag $ map mkMsg flags + where mkMsg (L loc flag) + = mkPlainErrMsg loc $ + (text "unknown flag in {-# OPTIONS #-} pragma:" <+> + text flag) + +----------------------------------------------------------------------------- checkExtension :: Located FastString -> Located String checkExtension (L l ext) - = case reads (unpackFS ext) of - [] -> languagePragParseError l - (okExt,""):_ -> case extensionsToGHCFlag [okExt] of - ([],[opt]) -> L l opt - _ -> unsupportedExtnError l okExt +-- Checks if a given extension is valid, and if so returns +-- its corresponding flag. Otherwise it throws an exception. + = let ext' = unpackFS ext in + if ext' `elem` supportedLanguages + || ext' `elem` (map ("No"++) supportedLanguages) + then L l ("-X"++ext') + else unsupportedExtnError l ext' +languagePragParseError :: SrcSpan -> a languagePragParseError loc = - pgmError (showSDoc (mkLocMessage loc ( - text "cannot parse LANGUAGE pragma"))) + throw $ mkSrcErr $ unitBag $ + (mkPlainErrMsg loc $ + vcat [ text "Cannot parse LANGUAGE pragma" + , text "Expecting comma-separated list of language options," + , text "each starting with a capital letter" + , nest 2 (text "E.g. {-# LANGUAGE RecordPuns, Generics #-}") ]) +unsupportedExtnError :: SrcSpan -> String -> a unsupportedExtnError loc unsup = - pgmError (showSDoc (mkLocMessage loc ( - text "unsupported extension: " <> - (text.show) unsup))) + throw $ mkSrcErr $ unitBag $ + mkPlainErrMsg loc $ + text "Unsupported extension: " <> text unsup optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages -optionsErrorMsgs unhandled_flags flags_lines filename +optionsErrorMsgs unhandled_flags flags_lines _filename = (emptyBag, listToBag (map mkMsg unhandled_flags_lines)) where unhandled_flags_lines = [ L l f | f <- unhandled_flags, L l f' <- flags_lines, f == f' ]