X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=91849091b50c08938cb9fcbb2e066e1c24b07dfe;hb=25ed0cf7d4c2fbf9e455405f0a8525e0ae27b4e7;hp=717a847cbaf570b32e78e71ccd0716e777ec9230;hpb=e7f1092c0b5efe110006638faf9c6e40b22a6ccc;p=ghc-hetmet.git diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs index 717a847..9184909 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 @@ -8,96 +8,89 @@ -- ----------------------------------------------------------------------------- -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 import FastString import HsSyn ( ImportDecl(..), HsModule(..) ) import Module ( ModuleName, moduleName ) import PrelNames ( gHC_PRIM, mAIN_NAME ) -import StringBuffer ( StringBuffer(..), hGetStringBuffer, hGetStringBufferBlock +import StringBuffer ( StringBuffer(..), hGetStringBufferBlock , appendStringBuffers ) -import Config import SrcLoc import DynFlags import ErrUtils import Util import Outputable import Pretty () -import Panic import Maybes -import Bag ( emptyBag, listToBag ) +import Bag ( emptyBag, listToBag, unitBag ) -import Distribution.Compiler -import Distribution.Version - -import Control.Exception +import MonadUtils ( MonadIO ) +import Exception import Control.Monad -import System.Exit import System.IO import Data.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 +------------------------------------------------------------------------------ + +-- | 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 0 case unP parseHeader (mkPState buf loc dflags) of - PFailed span err -> parseError span err - POk pst rdr_module -> do - let ms = getMessages pst - printErrorsAndWarnings dflags ms - when (errorsFound dflags ms) $ exitWith (ExitFailure 1) + PFailed span err -> parseError span err + POk pst rdr_module -> do + let ms@(warns, errs) = getMessages pst + logWarnings warns + if errorsFound dflags ms + then liftIO $ throwIO $ mkSrcErr errs + else case rdr_module of - L _ (HsModule mb_mod _ imps _ _ _ _ _) -> + L _ (HsModule mb_mod _ imps _ _ _ _) -> let - mod = mb_mod `orElse` L (srcLocSpan loc) 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 0 + 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) + 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 - = Control.Exception.bracket +-- | 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 -> @@ -107,7 +100,7 @@ getOptionsFromFile filename loop handle buf | len buf == 0 = return [] | otherwise - = case getOptions' buf filename of + = case getOptions' dflags buf filename of (Nothing, opts) -> return opts (Just buf', opts) -> do nextBlock <- hGetStringBufferBlock handle blockSize newBuf <- appendStringBuffers buf' nextBlock @@ -116,26 +109,33 @@ getOptionsFromFile filename else do opts' <- loop handle newBuf return (opts++opts') -getOptions :: StringBuffer -> FilePath -> [Located String] -getOptions buf filename - = case getOptions' buf filename of +-- | 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 + = case getOptions' dflags buf filename of (_,opts) -> opts -- 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 +getOptions' :: DynFlags + -> 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)) +getOptions' dflags buf filename + = parseToks (lexAll (pragState dflags buf loc)) where loc = mkSrcLoc (mkFastString filename) 1 0 - getToken (buf,L _loc tok) = tok - getLoc (buf,L loc _tok) = loc + 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) @@ -150,6 +150,15 @@ getOptions' buf filename , ITclose_prag <- getToken close = map (L (getLoc open)) ["-#include",removeSpaces str] `combine` parseToks xs + parseToks (open:close:xs) + | ITdocOptions str <- getToken open + , ITclose_prag <- getToken close + = map (L (getLoc open)) ["-haddock-opts", removeSpaces str] + `combine` parseToks xs + parseToks (open:xs) + | ITdocOptionsOld str <- getToken open + = map (L (getLoc open)) ["-haddock-opts", removeSpaces str] + `combine` parseToks xs parseToks (open:xs) | ITlanguage_prag <- getToken open = parseLanguage xs @@ -165,42 +174,62 @@ getOptions' buf filename parseLanguage ((_buf,L loc (ITconid fs)):rest) = checkExtension (L loc fs) `add` case rest of - (_,L loc ITcomma):more -> parseLanguage more - (_,L loc ITclose_prag):more -> parseToks more + (_,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) + parseLanguage [] + = panic "getOptions'.parseLanguage(2) went past eof token" lexToken t = return t lexAll state = case unP (lexer lexToken) state of - POk state' t@(L _ ITeof) -> [(buffer state,t)] + POk _ t@(L _ ITeof) -> [(buffer state,t)] POk state' t -> (buffer state,t):lexAll state' _ -> [(buffer state,L (last_loc state) ITeof)] +----------------------------------------------------------------------------- + +-- | 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 readVersion cProjectVersion of - Just version -> - case extensionsToGHCFlag version [okExt] of - ([],[opt]) -> L l opt - _ -> unsupportedExtnError l okExt - Nothing -> - panic ("Can't parse version: " ++ show cProjectVersion) - +-- 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 $ + text "cannot parse LANGUAGE pragma: comma-separated list expected") +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' ]