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Diffstat (limited to 'compiler/main/HscMain.lhs')
| -rw-r--r-- | compiler/main/HscMain.lhs | 965 |
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diff --git a/compiler/main/HscMain.lhs b/compiler/main/HscMain.lhs new file mode 100644 index 0000000000..e170f8fa31 --- /dev/null +++ b/compiler/main/HscMain.lhs @@ -0,0 +1,965 @@ +% +% (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(..), LHsExpr, LStmt, LHsType ) +import Module ( Module ) +import CodeOutput ( outputForeignStubs ) +import ByteCodeGen ( byteCodeGen, coreExprToBCOs ) +import Linker ( HValue, linkExpr ) +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 ( noSrcLoc ) +import VarEnv ( emptyTidyEnv ) +#endif + +import Var ( Id ) +import Module ( emptyModuleEnv, ModLocation(..) ) +import RdrName ( GlobalRdrEnv, RdrName ) +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 Packages ( mkHomeModules ) +import Name ( Name, NamedThing(..) ) +import SimplStg ( stg2stg ) +import CodeGen ( codeGen ) +import CmmParse ( parseCmmFile ) +import CodeOutput ( codeOutput ) + +import DynFlags +import ErrUtils +import UniqSupply ( mkSplitUniqSupply ) + +import Outputable +import HscStats ( ppSourceStats ) +import HscTypes +import MkExternalCore ( emitExternalCore ) +import ParserCore +import ParserCoreUtils +import FastString +import Maybes ( expectJust ) +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 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 } ) } + + +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) + +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 + 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 showMsg "Skipping " + + + +-------------------------------------------------------------- +-- 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 + ------------------- + -> do (warns, maybe_ds_result) <- {-# SCC "DeSugar" #-} + deSugar hsc_env tc_result + printBagOfWarnings dflags warns + return maybe_ds_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) 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_home_mods = home_mods, + 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 home_mods this_mod prepd_binds + ------------------ Code generation ------------------ + abstractC <- {-# SCC "CodeGen" #-} + codeGen dflags home_mods 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 (mkHomeModules []) 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 home_mods this_mod prepd_binds + = do + stg_binds <- {-# SCC "Core2Stg" #-} + coreToStg home_mods prepd_binds + + (stg_binds2, cost_centre_info) <- {-# SCC "Stg2Stg" #-} + stg2stg dflags home_mods 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 { + + -- Then desugar, code gen, and link it + ; hval <- compileExpr hsc_env iNTERACTIVE + (ic_rn_gbl_env new_ic) + (ic_type_env new_ic) + tc_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 ; + Just other -> do { errorMsg (hsc_dflags hsc_env) (text "not an type:" <+> quotes (text str)) ; + return Nothing } ; + 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("<interactive>") 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 + -> Module -> GlobalRdrEnv -> TypeEnv + -> LHsExpr Id + -> IO HValue + +compileExpr hsc_env this_mod rdr_env type_env tc_expr + = do { let { dflags = hsc_dflags hsc_env ; + lint_on = dopt Opt_DoCoreLinting dflags } + + -- Desugar it + ; ds_expr <- deSugarExpr hsc_env this_mod rdr_env type_env tc_expr + + -- 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 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} + |