X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=d79c3eec02dd9a33329baa5b29a70d63257dfd31;hb=5892af0e08fdb890b5a0b9a64346d9f7773a6ed8;hp=0915e60275a8b8299ef3da88da4840d6aef98b6e;hpb=f518c9f9c6a5a267a3c01aec6822ef44b6efac50;p=ghc-hetmet.git diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs index 0915e60..d79c3ee 100644 --- a/compiler/main/HeaderInfo.hs +++ b/compiler/main/HeaderInfo.hs @@ -1,13 +1,6 @@ -{-# OPTIONS -fno-warn-incomplete-patterns #-} --- The above warning supression flag is a temporary kludge. --- While working on this module you are encouraged to remove it and fix --- any warnings in the module. See --- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings --- for details - ----------------------------------------------------------------------------- -- --- 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 @@ -17,10 +10,12 @@ module HeaderInfo ( getImports , getOptionsFromFile, getOptions - , optionsErrorMsgs ) where + , optionsErrorMsgs, + checkProcessArgsResult ) where #include "HsVersions.h" +import HscTypes import Parser ( parseHeader ) import Lexer import FastString @@ -35,68 +30,79 @@ import ErrUtils import Util import Outputable import Pretty () -import Panic import Maybes -import Bag ( emptyBag, listToBag ) +import Bag ( emptyBag, listToBag, unitBag ) -import Control.Exception +import MonadUtils ( MonadIO ) +import Exception import Control.Monad -import System.Exit import System.IO import Data.List -#if !defined(__GLASGOW_HASKELL__) || __GLASGOW_HASKELL__ >= 601 - -- already imported above ---import System.IO ( openBinaryFile ) -#else -import IOExts ( openFileEx, IOModeEx(..) ) -#endif - -#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ < 601 -openBinaryFile fp mode = openFileEx fp (BinaryMode mode) -#endif +------------------------------------------------------------------------------ -getImports :: DynFlags -> StringBuffer -> FilePath -> FilePath - -> IO ([Located ModuleName], [Located ModuleName], Located ModuleName) +-- | 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 ModuleName], [Located ModuleName], 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 _ _ _ _) -> let main_loc = mkSrcLoc (mkFastString source_filename) 1 0 mod = mb_mod `orElse` L (srcLocSpan main_loc) mAIN_NAME - (src_idecls, ord_idecls) = partition isSourceIdecl (map unLoc imps) - source_imps = map getImpMod src_idecls + imps' = filter isHomeImp (map unLoc imps) + (src_idecls, ord_idecls) = partition isSourceIdecl imps' + source_imps = map getImpMod src_idecls ordinary_imps = filter ((/= moduleName gHC_PRIM) . unLoc) (map getImpMod ord_idecls) -- GHC.Prim doesn't exist physically, so don't go looking for it. in return (source_imps, ordinary_imps, mod) -parseError :: SrcSpan -> Message -> a -parseError span err = throwDyn $ mkPlainErrMsg span err +parseError :: GhcMonad m => SrcSpan -> Message -> m a +parseError span err = throwOneError $ mkPlainErrMsg span err + +-- we aren't interested in package imports here, filter them out +isHomeImp :: ImportDecl name -> Bool +isHomeImp (ImportDecl _ (Just p) _ _ _ _) = p == fsLit "this" +isHomeImp (ImportDecl _ Nothing _ _ _ _) = True isSourceIdecl :: ImportDecl name -> Bool -isSourceIdecl (ImportDecl _ s _ _ _) = s +isSourceIdecl (ImportDecl _ _ s _ _ _) = s getImpMod :: ImportDecl name -> Located ModuleName -getImpMod (ImportDecl located_mod _ _ _ _) = located_mod +getImpMod (ImportDecl located_mod _ _ _ _ _) = located_mod -------------------------------------------------------------- -- 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 -> @@ -106,7 +112,7 @@ 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 @@ -115,22 +121,29 @@ 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 @@ -176,14 +189,34 @@ getOptions' buf filename (_,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 _ 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) -- Checks if a given extension is valid, and if so returns @@ -196,14 +229,15 @@ checkExtension (L 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 unsup))) + throw $ mkSrcErr $ unitBag $ + mkPlainErrMsg loc $ + text "unsupported extension: " <> text unsup optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages