X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FHscMain.lhs;h=ed6f405ae64c1c52dd06941d52c12a1c753c9ecc;hb=76ebf3dcb916a1116302896090059c9c32ab5c6a;hp=eebf4bd3a899063c9302331e235be7ae5ae8f415;hpb=b125ffe2eff1a31ab7b53e1dc2355fe6115838d9;p=ghc-hetmet.git diff --git a/ghc/compiler/main/HscMain.lhs b/ghc/compiler/main/HscMain.lhs index eebf4bd..ed6f405 100644 --- a/ghc/compiler/main/HscMain.lhs +++ b/ghc/compiler/main/HscMain.lhs @@ -1,49 +1,82 @@ % % (c) The GRASP/AQUA Project, Glasgow University, 1993-2000 % + \section[GHC_Main]{Main driver for Glasgow Haskell compiler} \begin{code} -module HscMain ( hscMain ) where +module HscMain ( + HscResult(..), hscMain, initPersistentCompilerState +#ifdef GHCI + , hscStmt, hscTcExpr, hscThing, + , compileExpr +#endif + ) where #include "HsVersions.h" -import IO ( hPutStr, stderr ) +#ifdef GHCI +import TcHsSyn ( TypecheckedHsExpr ) +import CodeOutput ( outputForeignStubs ) +import ByteCodeGen ( byteCodeGen, coreExprToBCOs ) +import Linker ( HValue, linkExpr ) +import TidyPgm ( tidyCoreExpr ) +import CorePrep ( corePrepExpr ) +import Flattening ( flattenExpr ) +import TcRnDriver ( tcRnStmt, tcRnExpr, tcRnThing ) +import RdrHsSyn ( RdrNameStmt ) +import Type ( Type ) +import PrelNames ( iNTERACTIVE ) +import StringBuffer ( stringToStringBuffer ) +import SrcLoc ( noSrcLoc ) +import Name ( Name ) +import CoreLint ( lintUnfolding ) +#endif + import HsSyn -import RdrHsSyn ( RdrNameHsModule ) -import FastString ( unpackFS ) +import RdrName ( nameRdrName ) import StringBuffer ( hGetStringBuffer ) -import Parser ( parse ) -import Lex ( PState(..), ParseResult(..) ) +import Parser +import Lexer ( P(..), ParseResult(..), mkPState, showPFailed ) import SrcLoc ( mkSrcLoc ) - -import Rename ( renameModule ) - -import PrelInfo ( wiredInThings ) +import TcRnDriver ( checkOldIface, tcRnModule, tcRnExtCore, tcRnIface ) +import RnEnv ( extendOrigNameCache ) +import PrelInfo ( wiredInThingEnv, knownKeyNames ) import PrelRules ( builtinRules ) -import MkIface ( writeIface ) -import TcModule ( TcResults(..), typecheckModule ) -import Desugar ( deSugar ) -import SimplCore ( core2core ) -import OccurAnal ( occurAnalyseBinds ) -import CoreUtils ( coreBindsSize ) -import CoreTidy ( tidyCorePgm ) -import CoreToStg ( topCoreBindsToStg ) -import StgSyn ( collectFinalStgBinders ) +import MkIface ( mkIface ) +import Desugar +import Flattening ( flatten ) +import SimplCore +import TidyPgm ( tidyCorePgm ) +import CorePrep ( corePrepPgm ) +import CoreToStg ( coreToStg ) import SimplStg ( stg2stg ) import CodeGen ( codeGen ) import CodeOutput ( codeOutput ) -import Module ( ModuleName, moduleNameUserString ) +import Module ( emptyModuleEnv ) import CmdLineOpts -import ErrUtils ( ghcExit, doIfSet, dumpIfSet ) +import DriverPhases ( isExtCore_file ) +import ErrUtils ( dumpIfSet_dyn, showPass ) import UniqSupply ( mkSplitUniqSupply ) +import Bag ( consBag, emptyBag ) import Outputable -import Char ( isSpace ) -import StgInterp ( runStgI ) import HscStats ( ppSourceStats ) +import HscTypes +import MkExternalCore ( emitExternalCore ) +import ParserCore +import ParserCoreUtils +import FiniteMap ( emptyFM ) +import Name ( nameModule ) +import Module ( Module, ModLocation(..), showModMsg ) +import FastString +import Maybes ( expectJust ) + +import Monad ( when ) +import Maybe ( isJust, fromJust ) +import IO \end{code} @@ -55,360 +88,541 @@ import HscStats ( ppSourceStats ) \begin{code} data HscResult - = HscOK ModDetails -- new details (HomeSymbolTable additions) - (Maybe ModIface) -- new iface (if any compilation was done) - (Maybe String) -- generated stub_h filename (in /tmp) - (Maybe String) -- generated stub_c filename (in /tmp) - (Maybe ([UnlinkedIBind],ItblEnv)) -- interpreted code, if any - PersistentCompilerState -- updated PCS - - | HscFail PersistentCompilerState -- updated PCS + -- compilation failed + = HscFail PersistentCompilerState -- updated PCS + -- concluded that it wasn't necessary + | HscNoRecomp PersistentCompilerState -- updated PCS + ModDetails -- new details (HomeSymbolTable additions) + ModIface -- new iface (if any compilation was done) + -- did recompilation + | HscRecomp PersistentCompilerState -- updated PCS + ModDetails -- new details (HomeSymbolTable additions) + ModIface -- new iface (if any compilation was done) + Bool -- stub_h exists + Bool -- stub_c exists + (Maybe CompiledByteCode) + -- no errors or warnings; the individual passes -- (parse/rename/typecheck) print messages themselves hscMain - :: DynFlags - -> ModSummary -- summary, including source filename - -> Maybe ModIFace -- old interface, if available - -> String -- file in which to put the output (.s, .hc, .java etc.) - -> HomeSymbolTable -- for home module ModDetails + :: HscEnv -> PersistentCompilerState -- IN: persistent compiler state + -> Module + -> ModLocation -- location info + -> Bool -- True <=> source unchanged + -> Bool -- True <=> have an object file (for msgs only) + -> Maybe ModIface -- old interface, if available -> IO HscResult -hscMain dflags core_cmds stg_cmds summary maybe_old_iface - output_filename mod_details pcs1 - = do - source_unchanged :: Bool -- extracted from summary? - - (pcs2, check_errs, (recomp_reqd, maybe_checked_iface)) - <- checkOldIface dflags finder hit hst pcs1 mod source_unchanged - maybe_old_iface - - -- test check_errs and give up if a problem happened - what_next = if recomp_reqd then hscRecomp else hscNoRecomp - - return $ - what_next dflags core_cmds stg_cmds summary hit hst - pcs2 maybe_checked_iface - -hscNoRecomp = panic "hscNoRecomp" - -hscRecomp dflags core_cmds stg_cmds summary hit hst pcs maybe_old_iface +hscMain hsc_env pcs mod location + source_unchanged have_object maybe_old_iface = do { - -- what target are we shooting for? - let toInterp = dopt_HscLang dflags == HscInterpreted; - - -- PARSE - maybe_parsed <- myParseModule dflags summary; - case maybe_parsed of { - Nothing -> return (HscFail pcs); - Just rdr_module -> do { - - -- RENAME - (pcs_rn, maybe_rn_result) - <- renameModule dflags finder hit hst pcs mod rdr_module; - case maybe_rn_result of { - Nothing -> return (HscFail pcs_rn); - Just (new_iface, rn_hs_decls) -> do { - - -- TYPECHECK - maybe_tc_result - <- typecheckModule dflags mod pcs_rn hst hit pit rn_hs_decls; - case maybe_tc_result of { - Nothing -> return (HscFail pcs_rn); - Just tc_result -> do { - - let pcs_tc = tc_pcs tc_result - let env_tc = tc_env tc_result - let binds_tc = tc_binds tc_result - let local_tycons = tc_tycons tc_result - let local_classes = tc_classes tc_result - - -- DESUGAR, SIMPLIFY, TIDY-CORE - -- We grab the the unfoldings at this point. - (tidy_binds, orphan_rules, fe_binders, h_code, c_code) -- return modDetails? - <- dsThenSimplThenTidy dflags mod tc_result rule_base ds_uniqs + (pcs_ch, maybe_chk_result) <- _scc_ "checkOldIface" + checkOldIface hsc_env pcs mod + (ml_hi_file location) + source_unchanged maybe_old_iface; + case maybe_chk_result of { + Nothing -> return (HscFail pcs_ch) ; + Just (recomp_reqd, maybe_checked_iface) -> do { + + let no_old_iface = not (isJust maybe_checked_iface) + what_next | recomp_reqd || no_old_iface = hscRecomp + | otherwise = hscNoRecomp + + ; what_next hsc_env pcs_ch have_object + mod location maybe_checked_iface + }}} + + +-- hscNoRecomp definitely expects to have the old interface available +hscNoRecomp hsc_env pcs_ch have_object + mod location (Just old_iface) + | hsc_mode hsc_env == OneShot + = do { + when (verbosity (hsc_dflags hsc_env) > 0) $ + hPutStrLn stderr "compilation IS NOT required"; + let { bomb = panic "hscNoRecomp:OneShot" }; + return (HscNoRecomp pcs_ch bomb bomb) + } + | otherwise + = do { + when (verbosity (hsc_dflags hsc_env) >= 1) $ + hPutStrLn stderr ("Skipping " ++ + showModMsg have_object mod location); - -- CONVERT TO STG - (stg_binds, cost_centre_info, top_level_ids) - <- myCoreToStg c2s_uniqs st_uniqs this_mod tidy_binds + -- Typecheck + (pcs_tc, maybe_tc_result) <- _scc_ "tcRnIface" + tcRnIface hsc_env pcs_ch old_iface ; - -- cook up a new ModDetails now we (finally) have all the bits - let new_details = completeModDetails tc_env tidy_binds top_level_ids orphan_rules + case maybe_tc_result of { + Nothing -> return (HscFail pcs_tc); + Just new_details -> + + return (HscNoRecomp pcs_tc new_details old_iface) + }} + +hscRecomp hsc_env pcs_ch have_object + mod location maybe_checked_iface + = do { + -- what target are we shooting for? + ; let one_shot = hsc_mode hsc_env == OneShot + ; let dflags = hsc_dflags hsc_env + ; let toInterp = dopt_HscLang dflags == HscInterpreted + ; let toCore = isJust (ml_hs_file location) && + isExtCore_file (fromJust (ml_hs_file location)) + + ; when (not one_shot && verbosity dflags >= 1) $ + hPutStrLn stderr ("Compiling " ++ + showModMsg (not toInterp) mod location); + + ; front_res <- if toCore then + hscCoreFrontEnd hsc_env pcs_ch location + else + hscFrontEnd hsc_env pcs_ch location + + ; case front_res of + Left flure -> return flure; + Right (pcs_tc, ds_result) -> do { + + + -- OMITTED: + -- ; seqList imported_modules (return ()) + + ------------------- + -- FLATTENING + ------------------- + ; flat_result <- _scc_ "Flattening" + flatten hsc_env pcs_tc ds_result + + + ; let -- Rule-base accumulated from imported packages + pkg_rule_base = eps_rule_base (pcs_EPS pcs_tc) + + -- In one-shot mode, ZAP the external package state at + -- this point, because we aren't going to need it from + -- now on. We keep the name cache, however, because + -- tidyCore needs it. + pcs_middle + | one_shot = pcs_tc{ pcs_EPS = error "pcs_EPS missing" } + | otherwise = pcs_tc + + ; pkg_rule_base `seq` pcs_middle `seq` return () + + -- alive at this point: + -- pcs_middle + -- flat_result + -- pkg_rule_base + + ------------------- + -- SIMPLIFY + ------------------- + ; simpl_result <- _scc_ "Core2Core" + core2core hsc_env pkg_rule_base flat_result + + ------------------- + -- TIDY + ------------------- + ; (pcs_simpl, tidy_result) + <- _scc_ "CoreTidy" + tidyCorePgm dflags pcs_middle simpl_result + + -- ZAP the persistent compiler state altogether now if we're + -- in one-shot mode, to save space. + ; pcs_final <- if one_shot then return (error "pcs_final missing") + else return pcs_simpl + + ; emitExternalCore dflags tidy_result + + -- Alive at this point: + -- tidy_result, pcs_final + -- hsc_env + + ------------------- + -- 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 <- _scc_ "MkFinalIface" + mkIface hsc_env location + maybe_checked_iface tidy_result + + + -- Space leak reduction: throw away the new interface if + -- we're in one-shot mode; we won't be needing it any + -- more. + ; final_iface <- + if one_shot then return (error "no final iface") + else return new_iface + + -- Build the final ModDetails (except in one-shot mode, where + -- we won't need this information after compilation). + ; final_details <- + if one_shot then return (error "no final details") + else return $! ModDetails { + md_types = mg_types tidy_result, + md_insts = mg_insts tidy_result, + md_rules = mg_rules tidy_result } + + ------------------- + -- CONVERT TO STG and COMPLETE CODE GENERATION + ; (stub_h_exists, stub_c_exists, maybe_bcos) + <- hscBackEnd dflags tidy_result + + -- and the answer is ... + ; return (HscRecomp pcs_final + final_details + final_iface + stub_h_exists stub_c_exists + maybe_bcos) + }} + +hscCoreFrontEnd hsc_env pcs_ch location = do { + ------------------- + -- PARSE + ------------------- + ; inp <- readFile (expectJust "hscCoreFrontEnd:hspp" (ml_hspp_file location)) + ; case parseCore inp 1 of + FailP s -> hPutStrLn stderr s >> return (Left (HscFail pcs_ch)); + OkP rdr_module -> do { + + ------------------- + -- RENAME and TYPECHECK + ------------------- + ; (pcs_tc, maybe_tc_result) <- _scc_ "TypeCheck" + tcRnExtCore hsc_env pcs_ch rdr_module + ; case maybe_tc_result of { + Nothing -> return (Left (HscFail pcs_tc)); + Just mod_guts -> return (Right (pcs_tc, mod_guts)) + -- No desugaring to do! + }}} + + +hscFrontEnd hsc_env pcs_ch location = do { + ------------------- + -- PARSE + ------------------- + ; maybe_parsed <- myParseModule (hsc_dflags hsc_env) + (expectJust "hscFrontEnd:hspp" (ml_hspp_file location)) + + ; case maybe_parsed of { + Nothing -> return (Left (HscFail pcs_ch)); + Just rdr_module -> do { + + ------------------- + -- RENAME and TYPECHECK + ------------------- + ; (pcs_tc, maybe_tc_result) <- _scc_ "Typecheck-Rename" + tcRnModule hsc_env pcs_ch rdr_module + ; case maybe_tc_result of { + Nothing -> return (Left (HscFail pcs_ch)); + Just tc_result -> do { + + ------------------- + -- DESUGAR + ------------------- + ; ds_result <- _scc_ "DeSugar" + deSugar hsc_env pcs_tc tc_result + ; return (Right (pcs_tc, ds_result)) + }}}}} + + +hscBackEnd dflags + ModGuts{ -- This is the last use of the ModGuts in a compilation. + -- From now on, we just use the bits we need. + mg_module = this_mod, + mg_binds = core_binds, + mg_types = type_env, + mg_dir_imps = dir_imps, + mg_foreign = foreign_stubs, + mg_deps = dependencies } = do { + + ------------------- + -- PREPARE FOR CODE GENERATION + -- Do saturation and convert to A-normal form + prepd_binds <- _scc_ "CorePrep" + corePrepPgm dflags core_binds type_env; + + case dopt_HscLang dflags of + HscNothing -> return (False, False, Nothing) + + HscInterpreted -> +#ifdef GHCI + do ----------------- Generate byte code ------------------ + comp_bc <- byteCodeGen dflags prepd_binds type_env + + ------------------ Create f-x-dynamic C-side stuff --- + (istub_h_exists, istub_c_exists) + <- outputForeignStubs dflags foreign_stubs + + return ( istub_h_exists, istub_c_exists, Just comp_bc ) +#else + panic "GHC not compiled with interpreter" +#endif - -- and possibly create a new ModIface - let maybe_final_iface = completeIface maybe_old_iface new_iface new_details + other -> + do + ----------------- Convert to STG ------------------ + (stg_binds, cost_centre_info) <- _scc_ "CoreToStg" + myCoreToStg dflags this_mod prepd_binds - -- do the rest of code generation/emission - (maybe_ibinds, maybe_stub_h_filename, maybe_stub_c_filename) - <- restOfCodeGeneration toInterp - this_mod imported_modules cost_centre_info - fe_binders local_tycons local_classes stg_binds + ------------------ Code generation ------------------ + abstractC <- _scc_ "CodeGen" + codeGen dflags this_mod type_env foreign_stubs + dir_imps cost_centre_info stg_binds - -- and the answer is ... - return (HscOK new_details maybe_final_iface - maybe_stub_h_filename maybe_stub_c_filename - maybe_ibinds pcs_tc) - }}}}}}} + ------------------ Code output ----------------------- + (stub_h_exists, stub_c_exists) + <- codeOutput dflags this_mod foreign_stubs + dependencies abstractC + return (stub_h_exists, stub_c_exists, Nothing) + } -myParseModule dflags summary - = do -------------------------- Reader ---------------- - show_pass "Parser" - -- _scc_ "Parser" - let src_filename -- name of the preprocessed source file - = case ms_ppsource summary of - Just (filename, fingerprint) -> filename - Nothing -> pprPanic "myParseModule:summary is not of a source module" - (ppr summary) +myParseModule dflags src_filename + = do -------------------------- Parser ---------------- + showPass dflags "Parser" + _scc_ "Parser" do + buf <- hGetStringBuffer src_filename - buf <- hGetStringBuffer True{-expand tabs-} src_filename + let loc = mkSrcLoc (mkFastString src_filename) 1 0 - let glaexts | dopt Opt_GlasgowExts dflags = 1# - | otherwise = 0# + case unP parseModule (mkPState buf loc dflags) of { - case parse buf PState{ bol = 0#, atbol = 1#, - context = [], glasgow_exts = glaexts, - loc = mkSrcLoc src_filename 1 } of { + PFailed l1 l2 err -> do { hPutStrLn stderr (showPFailed l1 l2 err); + return Nothing }; - PFailed err -> do hPutStrLn stderr (showSDoc err) - return Nothing - POk _ rdr_module@(HsModule mod_name _ _ _ _ _ _) -> + POk _ rdr_module -> do { - dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) + dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ; + dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics" - (ppSourceStats False rdr_module) - + (ppSourceStats False rdr_module) ; + return (Just rdr_module) + -- ToDo: free the string buffer later. + }} -restOfCodeGeneration toInterp this_mod imported_modules cost_centre_info - fe_binders local_tycons local_classes stg_binds - | toInterp - = return (Nothing, Nothing, stgToInterpSyn stg_binds local_tycons local_classes) - - | otherwise - = do -------------------------- Code generation ------------------------------- - show_pass "CodeGen" - -- _scc_ "CodeGen" - abstractC <- codeGen this_mod imported_modules - cost_centre_info fe_binders - local_tycons local_classes stg_binds - - -------------------------- Code output ------------------------------- - show_pass "CodeOutput" - -- _scc_ "CodeOutput" - (maybe_stub_h_name, maybe_stub_c_name) - <- codeOutput this_mod local_tycons local_classes - occ_anal_tidy_binds stg_binds2 - c_code h_code abstractC ncg_uniqs - - return (maybe_stub_h_name, maybe_stub_c_name, [{-UnlinkedIBind-}]) - - -dsThenSimplThenTidy dflags mod tc_result rule_base ds_uniqs - = do -------------------------- Desugaring ---------------- - -- _scc_ "DeSugar" - (desugared, rules, h_code, c_code, fe_binders) - <- deSugar this_mod ds_uniqs tc_results - - -------------------------- Main Core-language transformations ---------------- - -- _scc_ "Core2Core" - (simplified, orphan_rules) <- core2core core_cmds desugared rules - - -- Do the final tidy-up - (tidy_binds, tidy_orphan_rules) - <- tidyCorePgm this_mod simplified orphan_rules - - return (tidy_binds, tidy_orphan_rules, fe_binders, h_code, c_code) +myCoreToStg dflags this_mod prepd_binds + = do + stg_binds <- _scc_ "Core2Stg" + coreToStg dflags prepd_binds + (stg_binds2, cost_centre_info) <- _scc_ "Core2Stg" + stg2stg dflags this_mod stg_binds + return (stg_binds2, cost_centre_info) +\end{code} -myCoreToStg c2s_uniqs st_uniqs this_mod tidy_binds - = do let occ_anal_tidy_binds = occurAnalyseBinds tidy_binds - () <- coreBindsSize occ_anal_tidy_binds `seq` return () - -- TEMP: the above call zaps some space usage allocated by the - -- simplifier, which for reasons I don't understand, persists - -- thoroughout code generation +%************************************************************************ +%* * +\subsection{Compiling a do-statement} +%* * +%************************************************************************ - show_pass "Core2Stg" - -- _scc_ "Core2Stg" - let stg_binds = topCoreBindsToStg c2s_uniqs occ_anal_tidy_binds +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. - show_pass "Stg2Stg" - -- _scc_ "Stg2Stg" - (stg_binds2, cost_centre_info) <- stg2stg stg_cmds this_mod st_uniqs stg_binds - let final_ids = collectFinalStgBinders (map fst stg_binds2) +A naked expression returns a singleton Name [it]. - return (stg_binds2, cost_centre_info, final_ids) + 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,...] -#if 0 --- BEGIN old stuff - -------------------------- Reader ---------------- - show_pass "Parser" >> - _scc_ "Parser" + pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...] + bindings: [x,y,...] - let src_filename -- name of the preprocessed source file - = case ms_ppsource summary of - Just (filename, fingerprint) -> filename - Nothing -> pprPanic "hscMain:summary is not of a source module" - (ppr summary) + expr (of IO type) ==> expr >>= \ v -> return [v] + [NB: result not printed] bindings: [it] + - buf <- hGetStringBuffer True{-expand tabs-} src_filename + expr (of non-IO type, + result showable) ==> let v = expr in print v >> return [v] + bindings: [it] - let glaexts | dopt Opt_GlasgowExts dflags = 1# - | otherwise = 0# + expr (of non-IO type, + result not showable) ==> error - case parse buf PState{ bol = 0#, atbol = 1#, - context = [], glasgow_exts = glaexts, - loc = mkSrcLoc src_filename 1 } of { +\begin{code} +#ifdef GHCI +hscStmt -- Compile a stmt all the way to an HValue, but don't run it + :: HscEnv + -> PersistentCompilerState -- IN: persistent compiler state + -> InteractiveContext -- Context for compiling + -> String -- The statement + -> IO ( PersistentCompilerState, + Maybe (InteractiveContext, [Name], HValue) ) + +hscStmt hsc_env pcs icontext stmt + = do { maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) stmt + ; case maybe_stmt of { + Nothing -> return (pcs, Nothing) ; + Just parsed_stmt -> do { + + -- Rename and typecheck it + (pcs1, maybe_tc_result) + <- tcRnStmt hsc_env pcs icontext parsed_stmt + + ; case maybe_tc_result of { + Nothing -> return (pcs1, Nothing) ; + Just (new_ic, bound_names, tc_expr) -> do { + + -- Then desugar, code gen, and link it + ; hval <- compileExpr hsc_env pcs1 iNTERACTIVE + (ic_rn_gbl_env new_ic) + (ic_type_env new_ic) + tc_expr + + ; return (pcs1, Just (new_ic, bound_names, hval)) + }}}}} + +hscTcExpr -- Typecheck an expression (but don't run it) + :: HscEnv + -> PersistentCompilerState -- IN: persistent compiler state + -> InteractiveContext -- Context for compiling + -> String -- The expression + -> IO (PersistentCompilerState, Maybe Type) + +hscTcExpr hsc_env pcs icontext expr + = do { maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) expr + ; case maybe_stmt of { + Just (ExprStmt expr _ _) + -> tcRnExpr hsc_env pcs icontext expr ; + Just other -> do { hPutStrLn stderr ("not an expression: `" ++ expr ++ "'") ; + return (pcs, Nothing) } ; + Nothing -> return (pcs, Nothing) } } +\end{code} - PFailed err -> return (HscErrs pcs (unitBag err) emptyBag) +\begin{code} +hscParseStmt :: DynFlags -> String -> IO (Maybe RdrNameStmt) +hscParseStmt dflags str + = do showPass dflags "Parser" + _scc_ "Parser" do - POk _ rdr_module@(HsModule mod_name _ _ _ _ _ _) -> + buf <- stringToStringBuffer str - dumpIfSet (dopt_D_dump_parsed flags) "Parser" (ppr rdr_module) >> + let loc = mkSrcLoc FSLIT("") 1 0 - dumpIfSet (dopt_D_source_stats flags) "Source Statistics" - (ppSourceStats False rdr_module) >> + case unP parseStmt (mkPState buf loc dflags) of { - -- UniqueSupplies for later use (these are the only lower case uniques) - mkSplitUniqSupply 'd' >>= \ ds_uniqs -> -- desugarer - mkSplitUniqSupply 'r' >>= \ ru_uniqs -> -- rules - mkSplitUniqSupply 'c' >>= \ c2s_uniqs -> -- core-to-stg - mkSplitUniqSupply 'g' >>= \ st_uniqs -> -- stg-to-stg passes - mkSplitUniqSupply 'n' >>= \ ncg_uniqs -> -- native-code generator + PFailed l1 l2 err -> do { hPutStrLn stderr (showPFailed l1 l2 err); + return Nothing }; - -------------------------- Rename ---------------- - show_pass "Renamer" >> - _scc_ "Renamer" + -- no stmt: the line consisted of just space or comments + POk _ Nothing -> return Nothing; - renameModule dflags finder pcs hst rdr_module - >>= \ (pcs_rn, maybe_rn_stuff) -> - case maybe_rn_stuff of { - Nothing -> -- Hurrah! Renamer reckons that there's no need to - -- go any further - reportCompile mod_name "Compilation NOT required!" >> - return (); - - Just (this_mod, rn_mod, - old_iface, new_iface, - rn_name_supply, fixity_env, - imported_modules) -> - -- Oh well, we've got to recompile for real + POk _ (Just rdr_stmt) -> 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 rdr_stmt); + return (Just rdr_stmt) + }} +#endif +\end{code} - -------------------------- Typechecking ---------------- - show_pass "TypeCheck" >> - _scc_ "TypeCheck" - typecheckModule dflags mod pcs hst hit pit rn_mod - -- tc_uniqs rn_name_supply - -- fixity_env rn_mod - >>= \ maybe_tc_stuff -> - case maybe_tc_stuff of { - Nothing -> ghcExit 1; -- Type checker failed +%************************************************************************ +%* * +\subsection{Getting information about an identifer} +%* * +%************************************************************************ - Just (tc_results@(TcResults {tc_tycons = local_tycons, - tc_classes = local_classes, - tc_insts = inst_info })) -> +\begin{code} +#ifdef GHCI +hscThing -- like hscStmt, but deals with a single identifier + :: HscEnv + -> PersistentCompilerState -- IN: persistent compiler state + -> InteractiveContext -- Context for compiling + -> String -- The identifier + -> IO ( PersistentCompilerState, + [TyThing] ) +hscThing hsc_env pcs0 ic str + = do let dflags = hsc_dflags hsc_env - -------------------------- Desugaring ---------------- - _scc_ "DeSugar" - deSugar this_mod ds_uniqs tc_results >>= \ (desugared, rules, h_code, c_code, fe_binders) -> + maybe_rdr_name <- myParseIdentifier dflags str + case maybe_rdr_name of { + Nothing -> return (pcs0, []); + Just rdr_name -> do + (pcs1, maybe_tc_result) <- + tcRnThing hsc_env pcs0 ic rdr_name - -------------------------- Main Core-language transformations ---------------- - _scc_ "Core2Core" - core2core core_cmds desugared rules >>= \ (simplified, orphan_rules) -> + case maybe_tc_result of { + Nothing -> return (pcs1, []) ; + Just things -> return (pcs1, things) + }} - -- Do the final tidy-up - tidyCorePgm this_mod - simplified orphan_rules >>= \ (tidy_binds, tidy_orphan_rules) -> +myParseIdentifier dflags str + = do buf <- stringToStringBuffer str + + let loc = mkSrcLoc FSLIT("") 1 0 + case unP parseIdentifier (mkPState buf loc dflags) of - -- Run the occurrence analyser one last time, so that - -- dead binders get dead-binder info. This is exploited by - -- code generators to avoid spitting out redundant bindings. - -- The occurrence-zapping in Simplify.simplCaseBinder means - -- that the Simplifier nukes useful dead-var stuff especially - -- in case patterns. - let occ_anal_tidy_binds = occurAnalyseBinds tidy_binds in + PFailed l1 l2 err -> do { hPutStrLn stderr (showPFailed l1 l2 err); + return Nothing } - coreBindsSize occ_anal_tidy_binds `seq` --- TEMP: the above call zaps some space usage allocated by the --- simplifier, which for reasons I don't understand, persists --- thoroughout code generation + POk _ rdr_name -> return (Just rdr_name) +#endif +\end{code} +%************************************************************************ +%* * + Desugar, simplify, convert to bytecode, and link an expression +%* * +%************************************************************************ +\begin{code} +#ifdef GHCI +compileExpr :: HscEnv + -> PersistentCompilerState + -> Module -> GlobalRdrEnv -> TypeEnv + -> TypecheckedHsExpr + -> IO HValue + +compileExpr hsc_env pcs 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 pcs this_mod rdr_env type_env tc_expr + + -- Flatten it + ; flat_expr <- flattenExpr hsc_env pcs ds_expr - -------------------------- Convert to STG code ------------------------------- - show_pass "Core2Stg" >> - _scc_ "Core2Stg" - let - stg_binds = topCoreBindsToStg c2s_uniqs occ_anal_tidy_binds - in + -- Simplify it + ; simpl_expr <- simplifyExpr dflags flat_expr - -------------------------- Simplify STG code ------------------------------- - show_pass "Stg2Stg" >> - _scc_ "Stg2Stg" - stg2stg stg_cmds this_mod st_uniqs stg_binds >>= \ (stg_binds2, cost_centre_info) -> + -- Tidy it (temporary, until coreSat does cloning) + ; tidy_expr <- tidyCoreExpr simpl_expr -#ifdef GHCI - runStgI local_tycons local_classes - (map fst stg_binds2) >>= \ i_result -> - putStr ("\nANSWER = " ++ show i_result ++ "\n\n") - >> + -- Prepare for codegen + ; prepd_expr <- corePrepExpr dflags tidy_expr -#else - -------------------------- Interface file ------------------------------- - -- Dump instance decls and type signatures into the interface file - _scc_ "Interface" - let - final_ids = collectFinalStgBinders (map fst stg_binds2) - in - writeIface this_mod old_iface new_iface - local_tycons local_classes inst_info - final_ids occ_anal_tidy_binds tidy_orphan_rules >> - - - -------------------------- Code generation ------------------------------- - show_pass "CodeGen" >> - _scc_ "CodeGen" - codeGen this_mod imported_modules - cost_centre_info - fe_binders - local_tycons local_classes - stg_binds2 >>= \ abstractC -> - - - -------------------------- Code output ------------------------------- - show_pass "CodeOutput" >> - _scc_ "CodeOutput" - codeOutput this_mod local_tycons local_classes - occ_anal_tidy_binds stg_binds2 - c_code h_code abstractC - ncg_uniqs >> - - - -------------------------- Final report ------------------------------- - reportCompile mod_name (showSDoc (ppSourceStats True rdr_module)) >> + -- 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 () -#endif + -- Convert to BCOs + ; bcos <- coreExprToBCOs dflags prepd_expr + -- link it + ; hval <- linkExpr hsc_env pcs bcos - ghcExit 0 - } } - where - ------------------------------------------------------------- - -- ****** help functions: - - show_pass - = if opt_D_show_passes - then \ what -> hPutStr stderr ("*** "++what++":\n") - else \ what -> return () --- END old stuff + ; return hval + } #endif \end{code} @@ -422,189 +636,33 @@ myCoreToStg c2s_uniqs st_uniqs this_mod tidy_binds \begin{code} initPersistentCompilerState :: IO PersistentCompilerState initPersistentCompilerState -<<<<<<< HscMain.lhs - = do prs <- initPersistentRenamerState - return ( - PCS { pcs_PST = initPackageDetails, - pcs_insts = emptyInstEnv, - pcs_rules = emptyRuleEnv, - pcs_PRS = initPersistentRenamerState - } - ) -======= - = PCS { pcs_PST = initPackageDetails, - pcs_insts = emptyInstEnv, - pcs_rules = initRules, - pcs_PRS = initPersistentRenamerState } ->>>>>>> 1.12 - -initPackageDetails :: PackageSymbolTable -initPackageDetails = extendTypeEnv emptyModuleEnv wiredInThings - -initPersistentRenamerState :: IO PersistentRenamerState - = do ns <- mkSplitUniqSupply 'r' + = do nc <- initNameCache return ( - PRS { prsOrig = Orig { origNames = initOrigNames, - origIParam = emptyFM }, - prsDecls = emptyNameEnv, - prsInsts = emptyBag, - prsRules = emptyBag, - prsNS = ns - } - ) - -initOrigNames :: FiniteMap (ModuleName,OccName) Name -initOrigNames = grab knownKeyNames `plusFM` grab (map getName wiredInThings) - where - grab names = foldl add emptyFM names - add env name = addToFM env (moduleName (nameModule name), nameOccName name) name - - -initRules :: RuleEnv -initRules = foldl add emptyVarEnv builtinRules - where - add env (name,rule) = extendNameEnv_C add1 env name [rule] - add1 rules _ = rule : rules -\end{code} - - - -\begin{code} -writeIface this_mod old_iface new_iface - local_tycons local_classes inst_info - final_ids tidy_binds tidy_orphan_rules - = - if isNothing opt_HiDir && isNothing opt_HiFile - then return () -- not producing any .hi file - else - - let - hi_suf = case opt_HiSuf of { Nothing -> "hi"; Just suf -> suf } - filename = case opt_HiFile of { - Just f -> f; - Nothing -> - case opt_HiDir of { - Just dir -> dir ++ '/':moduleUserString this_mod - ++ '.':hi_suf; - Nothing -> panic "writeIface" - }} - in - - do maybe_final_iface <- checkIface old_iface full_new_iface - case maybe_final_iface of { - Nothing -> when opt_D_dump_rn_trace $ - putStrLn "Interface file unchanged" ; -- No need to update .hi file - - Just final_iface -> - - do let mod_vers_unchanged = case old_iface of - Just iface -> pi_vers iface == pi_vers final_iface - Nothing -> False - when (mod_vers_unchanged && opt_D_dump_rn_trace) $ - putStrLn "Module version unchanged, but usages differ; hence need new hi file" - - if_hdl <- openFile filename WriteMode - printForIface if_hdl (pprIface final_iface) - hClose if_hdl - } - where - full_new_iface = completeIface new_iface local_tycons local_classes - inst_info final_ids tidy_binds - tidy_orphan_rules -\end{code} - - -%************************************************************************ -%* * -\subsection{Printing the interface} -%* * -%************************************************************************ - -\begin{code} -pprIface (ParsedIface { pi_mod = mod, pi_vers = mod_vers, pi_orphan = orphan, - pi_usages = usages, pi_exports = exports, - pi_fixity = (fix_vers, fixities), - pi_insts = insts, pi_decls = decls, - pi_rules = (rule_vers, rules), pi_deprecs = deprecs }) - = vcat [ ptext SLIT("__interface") - <+> doubleQuotes (ptext opt_InPackage) - <+> ppr mod <+> ppr mod_vers <+> pp_sub_vers - <+> (if orphan then char '!' else empty) - <+> int opt_HiVersion - <+> ptext SLIT("where") - , vcat (map pprExport exports) - , vcat (map pprUsage usages) - , pprFixities fixities - , vcat [ppr i <+> semi | i <- insts] - , vcat [ppr_vers v <+> ppr d <> semi | (v,d) <- decls] - , pprRules rules - , pprDeprecs deprecs - ] + PCS { pcs_EPS = initExternalPackageState, + pcs_nc = nc }) + +initNameCache :: IO NameCache + = do us <- mkSplitUniqSupply 'r' + return (NameCache { nsUniqs = us, + nsNames = initOrigNames, + nsIPs = emptyFM }) + +initExternalPackageState :: ExternalPackageState +initExternalPackageState + = emptyExternalPackageState { + eps_rules = foldr add_rule (emptyBag, 0) builtinRules, + eps_PTE = wiredInThingEnv, + } where - ppr_vers v | v == initialVersion = empty - | otherwise = int v - pp_sub_vers - | fix_vers == initialVersion && rule_vers == initialVersion = empty - | otherwise = brackets (ppr fix_vers <+> ppr rule_vers) + add_rule (name,rule) (rules, n_slurped) + = (gated_decl `consBag` rules, n_slurped) + where + gated_decl = (gate_fn, (mod, IfaceRuleOut rdr_name rule)) + mod = nameModule name + rdr_name = nameRdrName name -- Seems a bit of a hack to go back + -- to the RdrName + gate_fn vis_fn = vis_fn name -- Load the rule whenever name is visible + +initOrigNames :: OrigNameCache +initOrigNames = foldl extendOrigNameCache emptyModuleEnv knownKeyNames \end{code} - -When printing export lists, we print like this: - Avail f f - AvailTC C [C, x, y] C(x,y) - AvailTC C [x, y] C!(x,y) -- Exporting x, y but not C - -\begin{code} -pprExport :: ExportItem -> SDoc -pprExport (mod, items) - = hsep [ ptext SLIT("__export "), ppr mod, hsep (map upp_avail items) ] <> semi - where - upp_avail :: RdrAvailInfo -> SDoc - upp_avail (Avail name) = pprOccName name - upp_avail (AvailTC name []) = empty - upp_avail (AvailTC name ns) = hcat [pprOccName name, bang, upp_export ns'] - where - bang | name `elem` ns = empty - | otherwise = char '|' - ns' = filter (/= name) ns - - upp_export [] = empty - upp_export names = braces (hsep (map pprOccName names)) -\end{code} - - -\begin{code} -pprUsage :: ImportVersion OccName -> SDoc -pprUsage (m, has_orphans, is_boot, whats_imported) - = hsep [ptext SLIT("import"), pprModuleName m, - pp_orphan, pp_boot, - upp_import_versions whats_imported - ] <> semi - where - pp_orphan | has_orphans = char '!' - | otherwise = empty - pp_boot | is_boot = char '@' - | otherwise = empty - - -- Importing the whole module is indicated by an empty list - upp_import_versions NothingAtAll = empty - upp_import_versions (Everything v) = dcolon <+> int v - upp_import_versions (Specifically vm vf vr nvs) - = dcolon <+> int vm <+> int vf <+> int vr <+> hsep [ ppr n <+> int v | (n,v) <- nvs ] -\end{code} - - -\begin{code} -pprFixities [] = empty -pprFixities fixes = hsep (map ppr fixes) <> semi - -pprRules [] = empty -pprRules rules = hsep [ptext SLIT("{-## __R"), hsep (map ppr rules), ptext SLIT("##-}")] - -pprDeprecs [] = empty -pprDeprecs deps = hsep [ ptext SLIT("{-## __D"), guts, ptext SLIT("##-}")] - where - guts = hsep [ ppr ie <+> doubleQuotes (ppr txt) <> semi - | Deprecation ie txt _ <- deps ] -\end{code} - -