% % (c) The GRASP/AQUA Project, Glasgow University, 1993-2000 % \section[GHC_Main]{Main driver for Glasgow Haskell compiler} \begin{code} module HscMain ( newHscEnv, hscCmmFile , hscFileCheck , hscParseIdentifier #ifdef GHCI , hscStmt, hscTcExpr, hscKcType , compileExpr #endif , hscCompileOneShot -- :: Compiler HscStatus , hscCompileBatch -- :: Compiler (HscStatus, ModIface, ModDetails) , hscCompileNothing -- :: Compiler (HscStatus, ModIface, ModDetails) , hscCompileInteractive -- :: Compiler (InteractiveStatus, ModIface, ModDetails) , HscStatus (..) , InteractiveStatus (..) , HscChecked (..) ) where #include "HsVersions.h" #ifdef GHCI import HsSyn ( Stmt(..), LStmt, LHsType ) import CodeOutput ( outputForeignStubs ) import ByteCodeGen ( byteCodeGen, coreExprToBCOs ) import Linker ( HValue, linkExpr ) import CoreSyn ( CoreExpr ) import CoreTidy ( tidyExpr ) import CorePrep ( corePrepExpr ) import Flattening ( flattenExpr ) import Desugar ( deSugarExpr ) import SimplCore ( simplifyExpr ) import TcRnDriver ( tcRnStmt, tcRnExpr, tcRnType ) import Type ( Type ) import PrelNames ( iNTERACTIVE ) import Kind ( Kind ) import CoreLint ( lintUnfolding ) import DsMeta ( templateHaskellNames ) import SrcLoc ( SrcSpan, noSrcLoc, interactiveSrcLoc, srcLocSpan ) import VarEnv ( emptyTidyEnv ) #endif import Var ( Id ) import Module ( emptyModuleEnv, ModLocation(..) ) import RdrName ( GlobalRdrEnv, RdrName, emptyGlobalRdrEnv ) import HsSyn ( HsModule, LHsBinds, HsGroup, LIE, LImportDecl ) import SrcLoc ( Located(..) ) import StringBuffer ( hGetStringBuffer, stringToStringBuffer ) import Parser import Lexer ( P(..), ParseResult(..), mkPState ) import SrcLoc ( mkSrcLoc ) import TcRnDriver ( tcRnModule, tcRnExtCore ) import TcIface ( typecheckIface ) import TcRnMonad ( initIfaceCheck, TcGblEnv(..) ) import IfaceEnv ( initNameCache ) import LoadIface ( ifaceStats, initExternalPackageState ) import PrelInfo ( wiredInThings, basicKnownKeyNames ) import MkIface ( checkOldIface, mkIface, writeIfaceFile ) import Desugar ( deSugar ) import Flattening ( flatten ) import SimplCore ( core2core ) import TidyPgm ( tidyProgram, mkBootModDetails ) import CorePrep ( corePrepPgm ) import CoreToStg ( coreToStg ) import TyCon ( isDataTyCon ) import Name ( Name, NamedThing(..) ) import SimplStg ( stg2stg ) import CodeGen ( codeGen ) import CmmParse ( parseCmmFile ) import CodeOutput ( codeOutput ) import NameEnv ( emptyNameEnv ) import DynFlags import ErrUtils import UniqSupply ( mkSplitUniqSupply ) import Outputable import HscStats ( ppSourceStats ) import HscTypes import MkExternalCore ( emitExternalCore ) import ParserCore import ParserCoreUtils import FastString import UniqFM ( emptyUFM ) import Bag ( unitBag ) import Monad ( unless ) import IO import DATA_IOREF ( newIORef, readIORef ) \end{code} %************************************************************************ %* * Initialisation %* * %************************************************************************ \begin{code} newHscEnv :: DynFlags -> IO HscEnv newHscEnv dflags = do { eps_var <- newIORef initExternalPackageState ; us <- mkSplitUniqSupply 'r' ; nc_var <- newIORef (initNameCache us knownKeyNames) ; fc_var <- newIORef emptyUFM ; mlc_var <- newIORef emptyModuleEnv ; return (HscEnv { hsc_dflags = dflags, hsc_targets = [], hsc_mod_graph = [], hsc_IC = emptyInteractiveContext, hsc_HPT = emptyHomePackageTable, hsc_EPS = eps_var, hsc_NC = nc_var, hsc_FC = fc_var, hsc_MLC = mlc_var, hsc_global_rdr_env = emptyGlobalRdrEnv, hsc_global_type_env = emptyNameEnv } ) } knownKeyNames :: [Name] -- Put here to avoid loops involving DsMeta, -- where templateHaskellNames are defined knownKeyNames = map getName wiredInThings ++ basicKnownKeyNames #ifdef GHCI ++ templateHaskellNames #endif \end{code} %************************************************************************ %* * The main compiler pipeline %* * %************************************************************************ -------------------------------- The compilation proper -------------------------------- It's the task of the compilation proper to compile Haskell, hs-boot and core files to either byte-code, hard-code (C, asm, Java, ect) or to nothing at all (the module is still parsed and type-checked. This feature is mostly used by IDE's and the likes). Compilation can happen in either 'one-shot', 'batch', 'nothing', or 'interactive' mode. 'One-shot' mode targets hard-code, 'batch' mode targets hard-code, 'nothing' mode targets nothing and 'interactive' mode targets byte-code. The modes are kept separate because of their different types and meanings. In 'one-shot' mode, we're only compiling a single file and can therefore discard the new ModIface and ModDetails. This is also the reason it only targets hard-code; compiling to byte-code or nothing doesn't make sense when we discard the result. 'Batch' mode is like 'one-shot' except that we keep the resulting ModIface and ModDetails. 'Batch' mode doesn't target byte-code since that require us to return the newly compiled byte-code. 'Nothing' mode has exactly the same type as 'batch' mode but they're still kept separate. This is because compiling to nothing is fairly special: We don't output any interface files, we don't run the simplifier and we don't generate any code. 'Interactive' mode is similar to 'batch' mode except that we return the compiled byte-code together with the ModIface and ModDetails. Trying to compile a hs-boot file to byte-code will result in a run-time error. This is the only thing that isn't caught by the type-system. \begin{code} data HscChecked = HscChecked -- parsed (Located (HsModule RdrName)) -- renamed (Maybe (HsGroup Name,[LImportDecl Name],Maybe [LIE Name])) -- typechecked (Maybe (LHsBinds Id, GlobalRdrEnv, ModDetails)) -- Status of a compilation to hard-code or nothing. data HscStatus = HscNoRecomp | HscRecomp Bool -- Has stub files. -- This is a hack. We can't compile C files here -- since it's done in DriverPipeline. For now we -- just return True if we want the caller to compile -- it for us. -- Status of a compilation to byte-code. data InteractiveStatus = InteractiveNoRecomp | InteractiveRecomp Bool -- Same as HscStatus CompiledByteCode -- I want Control.Monad.State! --Lemmih 03/07/2006 newtype Comp a = Comp {runComp :: CompState -> IO (a, CompState)} instance Monad Comp where g >>= fn = Comp $ \s -> runComp g s >>= \(a,s') -> runComp (fn a) s' return a = Comp $ \s -> return (a,s) fail = error evalComp :: Comp a -> CompState -> IO a evalComp comp st = do (val,_st') <- runComp comp st return val data CompState = CompState { compHscEnv :: HscEnv , compModSummary :: ModSummary , compOldIface :: Maybe ModIface } get :: Comp CompState get = Comp $ \s -> return (s,s) modify :: (CompState -> CompState) -> Comp () modify f = Comp $ \s -> return ((), f s) gets :: (CompState -> a) -> Comp a gets getter = do st <- get return (getter st) liftIO :: IO a -> Comp a liftIO ioA = Comp $ \s -> do a <- ioA return (a,s) type NoRecomp result = ModIface -> Comp result type FrontEnd core = Comp (Maybe core) -- FIXME: The old interface and module index are only using in 'batch' and -- 'interactive' mode. They should be removed from 'oneshot' mode. type Compiler result = HscEnv -> ModSummary -> Bool -- True <=> source unchanged -> Maybe ModIface -- Old interface, if available -> Maybe (Int,Int) -- Just (i,n) <=> module i of n (for msgs) -> IO (Maybe result) -- This functions checks if recompilation is necessary and -- then combines the FrontEnd and BackEnd to a working compiler. hscMkCompiler :: NoRecomp result -- What to do when recompilation isn't required. -> (Maybe (Int,Int) -> Bool -> Comp ()) -> FrontEnd core -> (core -> Comp result) -- Backend. -> Compiler result hscMkCompiler norecomp messenger frontend backend hsc_env mod_summary source_unchanged mbOldIface mbModIndex = flip evalComp (CompState hsc_env mod_summary mbOldIface) $ do (recomp_reqd, mbCheckedIface) <- {-# SCC "checkOldIface" #-} liftIO $ checkOldIface hsc_env mod_summary source_unchanged mbOldIface -- save the interface that comes back from checkOldIface. -- In one-shot mode we don't have the old iface until this -- point, when checkOldIface reads it from the disk. modify (\s -> s{ compOldIface = mbCheckedIface }) case mbCheckedIface of Just iface | not recomp_reqd -> do messenger mbModIndex False result <- norecomp iface return (Just result) _otherwise -> do messenger mbModIndex True mbCore <- frontend case mbCore of Nothing -> return Nothing Just core -> do result <- backend core return (Just result) -------------------------------------------------------------- -- Compilers -------------------------------------------------------------- -- 1 2 3 4 5 6 7 8 9 -- Compile Haskell, boot and extCore in OneShot mode. hscCompileOneShot :: Compiler HscStatus hscCompileOneShot hsc_env mod_summary = compiler hsc_env mod_summary where mkComp = hscMkCompiler norecompOneShot oneShotMsg -- How to compile nonBoot files. nonBootComp inp = hscSimplify inp >>= hscNormalIface >>= hscWriteIface >>= hscOneShot -- How to compile boot files. bootComp inp = hscSimpleIface inp >>= hscWriteIface >>= hscConst (HscRecomp False) compiler = case ms_hsc_src mod_summary of ExtCoreFile -> mkComp hscCoreFrontEnd nonBootComp HsSrcFile -> mkComp hscFileFrontEnd nonBootComp HsBootFile -> mkComp hscFileFrontEnd bootComp -- Compile Haskell, boot and extCore in batch mode. hscCompileBatch :: Compiler (HscStatus, ModIface, ModDetails) hscCompileBatch hsc_env mod_summary = compiler hsc_env mod_summary where mkComp = hscMkCompiler norecompBatch batchMsg nonBootComp inp = hscSimplify inp >>= hscNormalIface >>= hscWriteIface >>= hscBatch bootComp inp = hscSimpleIface inp >>= hscWriteIface >>= hscNothing compiler = case ms_hsc_src mod_summary of ExtCoreFile -> mkComp hscCoreFrontEnd nonBootComp HsSrcFile -> mkComp hscFileFrontEnd nonBootComp HsBootFile -> mkComp hscFileFrontEnd bootComp -- Type-check Haskell, boot and extCore. -- Does it make sense to compile extCore to nothing? hscCompileNothing :: Compiler (HscStatus, ModIface, ModDetails) hscCompileNothing hsc_env mod_summary = compiler hsc_env mod_summary where mkComp = hscMkCompiler norecompBatch batchMsg pipeline inp = hscSimpleIface inp >>= hscIgnoreIface >>= hscNothing compiler = case ms_hsc_src mod_summary of ExtCoreFile -> mkComp hscCoreFrontEnd pipeline HsSrcFile -> mkComp hscFileFrontEnd pipeline HsBootFile -> mkComp hscFileFrontEnd pipeline -- Compile Haskell, extCore to bytecode. hscCompileInteractive :: Compiler (InteractiveStatus, ModIface, ModDetails) hscCompileInteractive hsc_env mod_summary = hscMkCompiler norecompInteractive batchMsg frontend backend hsc_env mod_summary where backend inp = hscSimplify inp >>= hscNormalIface >>= hscIgnoreIface >>= hscInteractive frontend = case ms_hsc_src mod_summary of ExtCoreFile -> hscCoreFrontEnd HsSrcFile -> hscFileFrontEnd HsBootFile -> panic bootErrorMsg bootErrorMsg = "Compiling a HsBootFile to bytecode doesn't make sense. " ++ "Use 'hscCompileBatch' instead." -------------------------------------------------------------- -- NoRecomp handlers -------------------------------------------------------------- norecompOneShot :: NoRecomp HscStatus norecompOneShot old_iface = do hsc_env <- gets compHscEnv liftIO $ do dumpIfaceStats hsc_env return HscNoRecomp norecompBatch :: NoRecomp (HscStatus, ModIface, ModDetails) norecompBatch = norecompWorker HscNoRecomp False norecompInteractive :: NoRecomp (InteractiveStatus, ModIface, ModDetails) norecompInteractive = norecompWorker InteractiveNoRecomp True norecompWorker :: a -> Bool -> NoRecomp (a, ModIface, ModDetails) norecompWorker a isInterp old_iface = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary liftIO $ do new_details <- {-# SCC "tcRnIface" #-} initIfaceCheck hsc_env $ typecheckIface old_iface dumpIfaceStats hsc_env return (a, old_iface, new_details) -------------------------------------------------------------- -- Progress displayers. -------------------------------------------------------------- oneShotMsg :: Maybe (Int,Int) -> Bool -> Comp () oneShotMsg _mb_mod_index recomp = do hsc_env <- gets compHscEnv liftIO $ do if recomp then return () else compilationProgressMsg (hsc_dflags hsc_env) $ "compilation IS NOT required" batchMsg :: Maybe (Int,Int) -> Bool -> Comp () batchMsg mb_mod_index recomp = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary let showMsg msg = compilationProgressMsg (hsc_dflags hsc_env) $ (showModuleIndex mb_mod_index ++ msg ++ showModMsg (hscTarget (hsc_dflags hsc_env)) recomp mod_summary) liftIO $ do if recomp then showMsg "Compiling " else if verbosity (hsc_dflags hsc_env) >= 2 then showMsg "Skipping " else return () -------------------------------------------------------------- -- FrontEnds -------------------------------------------------------------- hscCoreFrontEnd :: FrontEnd ModGuts hscCoreFrontEnd = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary liftIO $ do ------------------- -- PARSE ------------------- inp <- readFile (ms_hspp_file mod_summary) case parseCore inp 1 of FailP s -> do errorMsg (hsc_dflags hsc_env) (text s{-ToDo: wrong-}) return Nothing OkP rdr_module ------------------- -- RENAME and TYPECHECK ------------------- -> do (tc_msgs, maybe_tc_result) <- {-# SCC "TypeCheck" #-} tcRnExtCore hsc_env rdr_module printErrorsAndWarnings (hsc_dflags hsc_env) tc_msgs case maybe_tc_result of Nothing -> return Nothing Just mod_guts -> return (Just mod_guts) -- No desugaring to do! hscFileFrontEnd :: FrontEnd ModGuts hscFileFrontEnd = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary liftIO $ do ------------------- -- PARSE ------------------- let dflags = hsc_dflags hsc_env hspp_file = ms_hspp_file mod_summary hspp_buf = ms_hspp_buf mod_summary maybe_parsed <- myParseModule dflags hspp_file hspp_buf case maybe_parsed of Left err -> do printBagOfErrors dflags (unitBag err) return Nothing Right rdr_module ------------------- -- RENAME and TYPECHECK ------------------- -> do (tc_msgs, maybe_tc_result) <- {-# SCC "Typecheck-Rename" #-} tcRnModule hsc_env (ms_hsc_src mod_summary) False rdr_module printErrorsAndWarnings dflags tc_msgs case maybe_tc_result of Nothing -> return Nothing Just tc_result ------------------- -- DESUGAR ------------------- -> {-# SCC "DeSugar" #-} deSugar hsc_env tc_result -------------------------------------------------------------- -- Simplifiers -------------------------------------------------------------- hscSimplify :: ModGuts -> Comp ModGuts hscSimplify ds_result = do hsc_env <- gets compHscEnv liftIO $ do flat_result <- {-# SCC "Flattening" #-} flatten hsc_env ds_result ------------------- -- SIMPLIFY ------------------- simpl_result <- {-# SCC "Core2Core" #-} core2core hsc_env flat_result return simpl_result -------------------------------------------------------------- -- Interface generators -------------------------------------------------------------- -- HACK: we return ModGuts even though we know it's not gonna be used. -- We do this because the type signature needs to be identical -- in structure to the type of 'hscNormalIface'. hscSimpleIface :: ModGuts -> Comp (ModIface, Bool, ModDetails, ModGuts) hscSimpleIface ds_result = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary maybe_old_iface <- gets compOldIface liftIO $ do details <- mkBootModDetails hsc_env ds_result (new_iface, no_change) <- {-# SCC "MkFinalIface" #-} mkIface hsc_env maybe_old_iface ds_result details -- And the answer is ... dumpIfaceStats hsc_env return (new_iface, no_change, details, ds_result) hscNormalIface :: ModGuts -> Comp (ModIface, Bool, ModDetails, CgGuts) hscNormalIface simpl_result = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary maybe_old_iface <- gets compOldIface liftIO $ do ------------------- -- TIDY ------------------- (cg_guts, details) <- {-# SCC "CoreTidy" #-} tidyProgram hsc_env simpl_result ------------------- -- BUILD THE NEW ModIface and ModDetails -- and emit external core if necessary -- This has to happen *after* code gen so that the back-end -- info has been set. Not yet clear if it matters waiting -- until after code output (new_iface, no_change) <- {-# SCC "MkFinalIface" #-} mkIface hsc_env maybe_old_iface simpl_result details -- Emit external core emitExternalCore (hsc_dflags hsc_env) (mg_exports simpl_result) cg_guts -- Move this? --Lemmih 03/07/2006 dumpIfaceStats hsc_env ------------------- -- Return the prepared code. return (new_iface, no_change, details, cg_guts) -------------------------------------------------------------- -- BackEnd combinators -------------------------------------------------------------- hscWriteIface :: (ModIface, Bool, ModDetails, a) -> Comp (ModIface, ModDetails, a) hscWriteIface (iface, no_change, details, a) = do mod_summary <- gets compModSummary liftIO $ do unless no_change $ writeIfaceFile (ms_location mod_summary) iface return (iface, details, a) hscIgnoreIface :: (ModIface, Bool, ModDetails, a) -> Comp (ModIface, ModDetails, a) hscIgnoreIface (iface, no_change, details, a) = return (iface, details, a) -- Don't output any code. hscNothing :: (ModIface, ModDetails, a) -> Comp (HscStatus, ModIface, ModDetails) hscNothing (iface, details, a) = return (HscRecomp False, iface, details) -- Generate code and return both the new ModIface and the ModDetails. hscBatch :: (ModIface, ModDetails, CgGuts) -> Comp (HscStatus, ModIface, ModDetails) hscBatch (iface, details, cgguts) = do hasStub <- hscCompile cgguts return (HscRecomp hasStub, iface, details) -- Here we don't need the ModIface and ModDetails anymore. hscOneShot :: (ModIface, ModDetails, CgGuts) -> Comp HscStatus hscOneShot (_, _, cgguts) = do hasStub <- hscCompile cgguts return (HscRecomp hasStub) -- Compile to hard-code. hscCompile :: CgGuts -> Comp Bool hscCompile cgguts = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary liftIO $ do let CgGuts{ -- This is the last use of the ModGuts in a compilation. -- From now on, we just use the bits we need. cg_module = this_mod, cg_binds = core_binds, cg_tycons = tycons, cg_dir_imps = dir_imps, cg_foreign = foreign_stubs, cg_dep_pkgs = dependencies } = cgguts dflags = hsc_dflags hsc_env location = ms_location mod_summary data_tycons = filter isDataTyCon tycons -- cg_tycons includes newtypes, for the benefit of External Core, -- but we don't generate any code for newtypes ------------------- -- PREPARE FOR CODE GENERATION -- Do saturation and convert to A-normal form prepd_binds <- {-# SCC "CorePrep" #-} corePrepPgm dflags core_binds data_tycons ; ----------------- Convert to STG ------------------ (stg_binds, cost_centre_info) <- {-# SCC "CoreToStg" #-} myCoreToStg dflags this_mod prepd_binds ------------------ Code generation ------------------ abstractC <- {-# SCC "CodeGen" #-} codeGen dflags this_mod data_tycons foreign_stubs dir_imps cost_centre_info stg_binds ------------------ Code output ----------------------- (stub_h_exists,stub_c_exists) <- codeOutput dflags this_mod location foreign_stubs dependencies abstractC return stub_c_exists hscConst :: b -> a -> Comp b hscConst b a = return b hscInteractive :: (ModIface, ModDetails, CgGuts) -> Comp (InteractiveStatus, ModIface, ModDetails) hscInteractive (iface, details, cgguts) #ifdef GHCI = do hsc_env <- gets compHscEnv mod_summary <- gets compModSummary liftIO $ do let CgGuts{ -- This is the last use of the ModGuts in a compilation. -- From now on, we just use the bits we need. cg_module = this_mod, cg_binds = core_binds, cg_tycons = tycons, cg_foreign = foreign_stubs } = cgguts dflags = hsc_dflags hsc_env location = ms_location mod_summary data_tycons = filter isDataTyCon tycons -- cg_tycons includes newtypes, for the benefit of External Core, -- but we don't generate any code for newtypes ------------------- -- PREPARE FOR CODE GENERATION -- Do saturation and convert to A-normal form prepd_binds <- {-# SCC "CorePrep" #-} corePrepPgm dflags core_binds data_tycons ; ----------------- Generate byte code ------------------ comp_bc <- byteCodeGen dflags prepd_binds data_tycons ------------------ Create f-x-dynamic C-side stuff --- (istub_h_exists, istub_c_exists) <- outputForeignStubs dflags this_mod location foreign_stubs return (InteractiveRecomp istub_c_exists comp_bc, iface, details) #else = panic "GHC not compiled with interpreter" #endif ------------------------------ hscFileCheck :: HscEnv -> ModSummary -> IO (Maybe HscChecked) hscFileCheck hsc_env mod_summary = do { ------------------- -- PARSE ------------------- ; let dflags = hsc_dflags hsc_env hspp_file = ms_hspp_file mod_summary hspp_buf = ms_hspp_buf mod_summary ; maybe_parsed <- myParseModule dflags hspp_file hspp_buf ; case maybe_parsed of { Left err -> do { printBagOfErrors dflags (unitBag err) ; return Nothing } ; Right rdr_module -> do { ------------------- -- RENAME and TYPECHECK ------------------- (tc_msgs, maybe_tc_result) <- _scc_ "Typecheck-Rename" tcRnModule hsc_env (ms_hsc_src mod_summary) True{-save renamed syntax-} rdr_module ; printErrorsAndWarnings dflags tc_msgs ; case maybe_tc_result of { Nothing -> return (Just (HscChecked rdr_module Nothing Nothing)); Just tc_result -> do let md = ModDetails { md_types = tcg_type_env tc_result, md_exports = tcg_exports tc_result, md_insts = tcg_insts tc_result, md_rules = [panic "no rules"] } -- Rules are CoreRules, not the -- RuleDecls we get out of the typechecker rnInfo = do decl <- tcg_rn_decls tc_result imports <- tcg_rn_imports tc_result let exports = tcg_rn_exports tc_result return (decl,imports,exports) return (Just (HscChecked rdr_module rnInfo (Just (tcg_binds tc_result, tcg_rdr_env tc_result, md)))) }}}} hscCmmFile :: DynFlags -> FilePath -> IO Bool hscCmmFile dflags filename = do maybe_cmm <- parseCmmFile dflags filename case maybe_cmm of Nothing -> return False Just cmm -> do codeOutput dflags no_mod no_loc NoStubs [] [cmm] return True where no_mod = panic "hscCmmFile: no_mod" no_loc = ModLocation{ ml_hs_file = Just filename, ml_hi_file = panic "hscCmmFile: no hi file", ml_obj_file = panic "hscCmmFile: no obj file" } myParseModule dflags src_filename maybe_src_buf = -------------------------- Parser ---------------- showPass dflags "Parser" >> {-# SCC "Parser" #-} do -- sometimes we already have the buffer in memory, perhaps -- because we needed to parse the imports out of it, or get the -- module name. buf <- case maybe_src_buf of Just b -> return b Nothing -> hGetStringBuffer src_filename let loc = mkSrcLoc (mkFastString src_filename) 1 0 case unP parseModule (mkPState buf loc dflags) of { PFailed span err -> return (Left (mkPlainErrMsg span err)); POk _ rdr_module -> do { dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ; dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics" (ppSourceStats False rdr_module) ; return (Right rdr_module) -- ToDo: free the string buffer later. }} myCoreToStg dflags this_mod prepd_binds = do stg_binds <- {-# SCC "Core2Stg" #-} coreToStg (thisPackage dflags) prepd_binds (stg_binds2, cost_centre_info) <- {-# SCC "Stg2Stg" #-} stg2stg dflags this_mod stg_binds return (stg_binds2, cost_centre_info) \end{code} %************************************************************************ %* * \subsection{Compiling a do-statement} %* * %************************************************************************ When the UnlinkedBCOExpr is linked you get an HValue of type IO [HValue] When you run it you get a list of HValues that should be the same length as the list of names; add them to the ClosureEnv. A naked expression returns a singleton Name [it]. What you type The IO [HValue] that hscStmt returns ------------- ------------------------------------ let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...] bindings: [x,y,...] pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...] bindings: [x,y,...] expr (of IO type) ==> expr >>= \ v -> return [v] [NB: result not printed] bindings: [it] expr (of non-IO type, result showable) ==> let v = expr in print v >> return [v] bindings: [it] expr (of non-IO type, result not showable) ==> error \begin{code} #ifdef GHCI hscStmt -- Compile a stmt all the way to an HValue, but don't run it :: HscEnv -> String -- The statement -> IO (Maybe (HscEnv, [Name], HValue)) hscStmt hsc_env stmt = do { maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) stmt ; case maybe_stmt of { Nothing -> return Nothing ; -- Parse error Just Nothing -> return Nothing ; -- Empty line Just (Just parsed_stmt) -> do { -- The real stuff -- Rename and typecheck it let icontext = hsc_IC hsc_env ; maybe_tc_result <- tcRnStmt hsc_env icontext parsed_stmt ; case maybe_tc_result of { Nothing -> return Nothing ; Just (new_ic, bound_names, tc_expr) -> do { -- Desugar it ; let rdr_env = ic_rn_gbl_env new_ic type_env = ic_type_env new_ic ; mb_ds_expr <- deSugarExpr hsc_env iNTERACTIVE rdr_env type_env tc_expr ; case mb_ds_expr of { Nothing -> return Nothing ; Just ds_expr -> do { -- Then desugar, code gen, and link it ; let src_span = srcLocSpan interactiveSrcLoc ; hval <- compileExpr hsc_env src_span ds_expr ; return (Just (hsc_env{ hsc_IC=new_ic }, bound_names, hval)) }}}}}}} hscTcExpr -- Typecheck an expression (but don't run it) :: HscEnv -> String -- The expression -> IO (Maybe Type) hscTcExpr hsc_env expr = do { maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) expr ; let icontext = hsc_IC hsc_env ; case maybe_stmt of { Nothing -> return Nothing ; -- Parse error Just (Just (L _ (ExprStmt expr _ _))) -> tcRnExpr hsc_env icontext expr ; Just other -> do { errorMsg (hsc_dflags hsc_env) (text "not an expression:" <+> quotes (text expr)) ; return Nothing } ; } } hscKcType -- Find the kind of a type :: HscEnv -> String -- The type -> IO (Maybe Kind) hscKcType hsc_env str = do { maybe_type <- hscParseType (hsc_dflags hsc_env) str ; let icontext = hsc_IC hsc_env ; case maybe_type of { Just ty -> tcRnType hsc_env icontext ty ; Nothing -> return Nothing } } #endif \end{code} \begin{code} #ifdef GHCI hscParseStmt :: DynFlags -> String -> IO (Maybe (Maybe (LStmt RdrName))) hscParseStmt = hscParseThing parseStmt hscParseType :: DynFlags -> String -> IO (Maybe (LHsType RdrName)) hscParseType = hscParseThing parseType #endif hscParseIdentifier :: DynFlags -> String -> IO (Maybe (Located RdrName)) hscParseIdentifier = hscParseThing parseIdentifier hscParseThing :: Outputable thing => Lexer.P thing -> DynFlags -> String -> IO (Maybe thing) -- Nothing => Parse error (message already printed) -- Just x => success hscParseThing parser dflags str = showPass dflags "Parser" >> {-# SCC "Parser" #-} do buf <- stringToStringBuffer str let loc = mkSrcLoc FSLIT("") 1 0 case unP parser (mkPState buf loc dflags) of { PFailed span err -> do { printError span err; return Nothing }; POk _ thing -> do { --ToDo: can't free the string buffer until we've finished this -- compilation sweep and all the identifiers have gone away. dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr thing); return (Just thing) }} \end{code} %************************************************************************ %* * Desugar, simplify, convert to bytecode, and link an expression %* * %************************************************************************ \begin{code} #ifdef GHCI compileExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO HValue compileExpr hsc_env srcspan ds_expr = do { let { dflags = hsc_dflags hsc_env ; lint_on = dopt Opt_DoCoreLinting dflags } -- Flatten it ; flat_expr <- flattenExpr hsc_env ds_expr -- Simplify it ; simpl_expr <- simplifyExpr dflags flat_expr -- Tidy it (temporary, until coreSat does cloning) ; let tidy_expr = tidyExpr emptyTidyEnv simpl_expr -- Prepare for codegen ; prepd_expr <- corePrepExpr dflags tidy_expr -- Lint if necessary -- ToDo: improve SrcLoc ; if lint_on then case lintUnfolding noSrcLoc [] prepd_expr of Just err -> pprPanic "compileExpr" err Nothing -> return () else return () -- Convert to BCOs ; bcos <- coreExprToBCOs dflags prepd_expr -- link it ; hval <- linkExpr hsc_env srcspan bcos ; return hval } #endif \end{code} %************************************************************************ %* * Statistics on reading interfaces %* * %************************************************************************ \begin{code} dumpIfaceStats :: HscEnv -> IO () dumpIfaceStats hsc_env = do { eps <- readIORef (hsc_EPS hsc_env) ; dumpIfSet (dump_if_trace || dump_rn_stats) "Interface statistics" (ifaceStats eps) } where dflags = hsc_dflags hsc_env dump_rn_stats = dopt Opt_D_dump_rn_stats dflags dump_if_trace = dopt Opt_D_dump_if_trace dflags \end{code} %************************************************************************ %* * Progress Messages: Module i of n %* * %************************************************************************ \begin{code} showModuleIndex Nothing = "" showModuleIndex (Just (i,n)) = "[" ++ padded ++ " of " ++ n_str ++ "] " where n_str = show n i_str = show i padded = replicate (length n_str - length i_str) ' ' ++ i_str \end{code}