X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FCmdLineOpts.lhs;h=6942408563bd0c9424794a122d9e1eb09436c9af;hb=ef5b4b146aa172d8ac10f39b5eb3d7a0f948d8f1;hp=cf3d9e197fcda17e6045b089b9c741d26792ba28;hpb=35fb1e382c4561fbd8e1ad66cd515c706e62be41;p=ghc-hetmet.git diff --git a/ghc/compiler/main/CmdLineOpts.lhs b/ghc/compiler/main/CmdLineOpts.lhs index cf3d9e1..6942408 100644 --- a/ghc/compiler/main/CmdLineOpts.lhs +++ b/ghc/compiler/main/CmdLineOpts.lhs @@ -1,176 +1,105 @@ -% -% (c) The AQUA Project, Glasgow University, 1996-98 + +% (c) The University of Glasgow, 1996-2000 % \section[CmdLineOpts]{Things to do with command-line options} \begin{code} module CmdLineOpts ( - CoreToDo(..), - SimplifierSwitch(..), - StgToDo(..), - SwitchResult(..), - classifyOpts, - - intSwitchSet, - switchIsOn, - - -- debugging opts - dopt_D_dump_absC, - dopt_D_dump_asm, - dopt_D_dump_cpranal, - dopt_D_dump_cse, - dopt_D_dump_deriv, - dopt_D_dump_ds, - dopt_D_dump_flatC, - dopt_D_dump_foreign, - dopt_D_dump_hi_diffs, - dopt_D_dump_inlinings, - dopt_D_dump_occur_anal, - dopt_D_dump_parsed, - dopt_D_dump_realC, - dopt_D_dump_rn, - dopt_D_dump_rules, - dopt_D_dump_simpl, - dopt_D_dump_simpl_iterations, - dopt_D_dump_simpl_stats, - dopt_D_dump_spec, - dopt_D_dump_stg, - dopt_D_dump_stranal, - dopt_D_dump_tc, - dopt_D_dump_types, - dopt_D_dump_usagesp, - dopt_D_dump_worker_wrapper, - dopt_D_show_passes, - dopt_D_dump_rn_trace, - dopt_D_dump_rn_stats, - dopt_D_dump_stix, - dopt_D_dump_minimal_imports, - dopt_D_source_stats, - dopt_D_verbose_core2core, - dopt_D_verbose_stg2stg, - dopt_DoCoreLinting, - dopt_DoStgLinting, - dopt_DoUSPLinting, - - opt_PprStyle_NoPrags, + CoreToDo(..), buildCoreToDo, StgToDo(..), + SimplifierSwitch(..), + SimplifierMode(..), FloatOutSwitches(..), + + HscLang(..), + DynFlag(..), -- needed non-abstractly by DriverFlags + DynFlags(..), + PackageFlag(..), + + v_Static_hsc_opts, + + isStaticHscFlag, + + -- Manipulating DynFlags + defaultDynFlags, -- DynFlags + dopt, -- DynFlag -> DynFlags -> Bool + dopt_set, dopt_unset, -- DynFlags -> DynFlag -> DynFlags + dopt_CoreToDo, -- DynFlags -> [CoreToDo] + dopt_StgToDo, -- DynFlags -> [StgToDo] + dopt_HscLang, -- DynFlags -> HscLang + dopt_OutName, -- DynFlags -> String + getOpts, -- (DynFlags -> [a]) -> IO [a] + getVerbFlag, + updOptLevel, + + -- sets of warning opts + minusWOpts, + minusWallOpts, + + -- Output style options opt_PprUserLength, opt_PprStyle_Debug, - -- other dynamic flags - dopt_CoreToDo, - dopt_StgToDo, - - -- warning opts - opt_WarnDuplicateExports, - opt_WarnHiShadows, - opt_WarnIncompletePatterns, - opt_WarnMissingFields, - opt_WarnMissingMethods, - opt_WarnMissingSigs, - opt_WarnNameShadowing, - opt_WarnOverlappingPatterns, - opt_WarnSimplePatterns, - opt_WarnTypeDefaults, - opt_WarnUnusedBinds, - opt_WarnUnusedImports, - opt_WarnUnusedMatches, - opt_WarnDeprecations, - -- profiling opts opt_AutoSccsOnAllToplevs, opt_AutoSccsOnExportedToplevs, opt_AutoSccsOnIndividualCafs, - opt_AutoSccsOnDicts, opt_SccProfilingOn, opt_DoTickyProfiling, -- language opts - opt_AllStrict, opt_DictsStrict, opt_MaxContextReductionDepth, - dopt_AllowOverlappingInstances, - dopt_AllowUndecidableInstances, - dopt_GlasgowExts, - opt_Generics, opt_IrrefutableTuples, - opt_NumbersStrict, opt_Parallel, opt_SMP, + opt_RuntimeTypes, + opt_Flatten, -- optimisation opts - opt_DoSemiTagging, - opt_FoldrBuildOn, + opt_NoMethodSharing, + opt_NoStateHack, opt_LiberateCaseThreshold, - opt_StgDoLetNoEscapes, - opt_UnfoldCasms, - opt_UsageSPOn, - opt_UnboxStrictFields, + opt_CprOff, + opt_RulesOff, opt_SimplNoPreInlining, - opt_SimplDoEtaReduction, - opt_SimplDoLambdaEtaExpansion, - opt_SimplCaseOfCase, - opt_SimplCaseMerge, - opt_SimplPedanticBottoms, opt_SimplExcessPrecision, + opt_MaxWorkerArgs, -- Unfolding control - opt_UF_HiFileThreshold, opt_UF_CreationThreshold, opt_UF_UseThreshold, opt_UF_FunAppDiscount, opt_UF_KeenessFactor, opt_UF_UpdateInPlace, - opt_UF_CheapOp, opt_UF_DearOp, -- misc opts - opt_InPackage, + opt_ErrorSpans, opt_EmitCExternDecls, opt_EnsureSplittableC, opt_GranMacros, opt_HiVersion, opt_HistorySize, - opt_IgnoreAsserts, - opt_IgnoreIfacePragmas, - opt_NoHiCheck, - opt_NoImplicitPrelude, opt_OmitBlackHoling, - opt_OmitInterfacePragmas, - opt_ProduceExportCStubs, - opt_ProduceExportHStubs, - opt_NoPruneTyDecls, - opt_NoPruneDecls, - opt_ReportCompile, opt_Static, opt_Unregisterised, - opt_Verbose, - - opt_OutputLanguage, - opt_OutputFile, - - -- Code generation - opt_UseVanillaRegs, - opt_UseFloatRegs, - opt_UseDoubleRegs, - opt_UseLongRegs + opt_EmitExternalCore, + opt_PIC ) where #include "HsVersions.h" -import Array ( array, (//) ) -import GlaExts -import Argv +import {-# SOURCE #-} Packages (PackageState) import Constants -- Default values for some flags - +import Util +import FastString ( FastString, mkFastString ) +import Config import Maybes ( firstJust ) -import Panic ( panic ) -#if __GLASGOW_HASKELL__ < 301 -import ArrBase ( Array(..) ) -#else -import PrelArr ( Array(..) ) -#endif +import Panic ( ghcError, GhcException(UsageError) ) +import GLAEXTS +import DATA_IOREF ( IORef, readIORef ) +import UNSAFE_IO ( unsafePerformIO ) \end{code} %************************************************************************ @@ -188,14 +117,11 @@ Static flags are represented by top-level values of type Bool or Int, for example. They therefore have the same value throughout the invocation of hsc. -Dynamic flags are represented by a function: - - checkDynFlag :: DynFlag -> SwitchResult - -which is passed into hsc by the compilation manager for every -compilation. Dynamic flags are those that change on a per-compilation -basis, perhaps because they may be present in the OPTIONS pragma at -the top of a module. +Dynamic flags are represented by an abstract type, DynFlags, which is +passed into hsc by the compilation manager for every compilation. +Dynamic flags are those that change on a per-compilation basis, +perhaps because they may be present in the OPTIONS pragma at the top +of a module. Other flag-related blurb: @@ -216,52 +142,54 @@ main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop %************************************************************************ \begin{code} -data SwitchResult - = SwBool Bool -- on/off - | SwString FAST_STRING -- nothing or a String - | SwInt Int -- nothing or an Int -\end{code} - -\begin{code} data CoreToDo -- These are diff core-to-core passes, -- which may be invoked in any order, -- as many times as you like. = CoreDoSimplify -- The core-to-core simplifier. - (SimplifierSwitch -> SwitchResult) + SimplifierMode + [SimplifierSwitch] -- Each run of the simplifier can take a different -- set of simplifier-specific flags. | CoreDoFloatInwards - | CoreDoFloatOutwards Bool -- True <=> float lambdas to top level + | CoreDoFloatOutwards FloatOutSwitches | CoreLiberateCase | CoreDoPrintCore | CoreDoStaticArgs | CoreDoStrictness | CoreDoWorkerWrapper | CoreDoSpecialising - | CoreDoUSPInf - | CoreDoCPResult + | CoreDoSpecConstr + | CoreDoOldStrictness | CoreDoGlomBinds | CoreCSE + | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules + -- matching this string + + | CoreDoNothing -- useful when building up lists of these things \end{code} \begin{code} data StgToDo - = StgDoStaticArgs - | StgDoLambdaLift - | StgDoMassageForProfiling -- should be (next to) last + = StgDoMassageForProfiling -- should be (next to) last -- There's also setStgVarInfo, but its absolute "lastness" -- is so critical that it is hardwired in (no flag). | D_stg_stats \end{code} \begin{code} +data SimplifierMode -- See comments in SimplMonad + = SimplGently + | SimplPhase Int + data SimplifierSwitch = MaxSimplifierIterations Int - | SimplInlinePhase Int - | DontApplyRules | NoCaseOfCase - | SimplLetToCase + +data FloatOutSwitches + = FloatOutSw Bool -- True <=> float lambdas to top level + Bool -- True <=> float constants to top level, + -- even if they do not escape a lambda \end{code} %************************************************************************ @@ -274,9 +202,7 @@ data SimplifierSwitch data DynFlag -- debugging flags - = Opt_D_dump_all - | Opt_D_dump_most - | Opt_D_dump_absC + = Opt_D_dump_cmm | Opt_D_dump_asm | Opt_D_dump_cpranal | Opt_D_dump_deriv @@ -286,96 +212,442 @@ data DynFlag | Opt_D_dump_inlinings | Opt_D_dump_occur_anal | Opt_D_dump_parsed - | Opt_D_dump_realC | Opt_D_dump_rn | Opt_D_dump_simpl | Opt_D_dump_simpl_iterations | Opt_D_dump_spec + | Opt_D_dump_prep | Opt_D_dump_stg | Opt_D_dump_stranal | Opt_D_dump_tc | Opt_D_dump_types | Opt_D_dump_rules - | Opt_D_dump_usagesp | Opt_D_dump_cse | Opt_D_dump_worker_wrapper - | Opt_D_show_passes | Opt_D_dump_rn_trace | Opt_D_dump_rn_stats - | Opt_D_dump_stix + | Opt_D_dump_opt_cmm | Opt_D_dump_simpl_stats + | Opt_D_dump_tc_trace + | Opt_D_dump_if_trace + | Opt_D_dump_splices + | Opt_D_dump_BCOs + | Opt_D_dump_vect | Opt_D_source_stats | Opt_D_verbose_core2core | Opt_D_verbose_stg2stg + | Opt_D_dump_hi | Opt_D_dump_hi_diffs | Opt_D_dump_minimal_imports | Opt_DoCoreLinting | Opt_DoStgLinting - | Opt_DoUSPLinting + | Opt_DoCmmLinting + + | Opt_WarnIsError -- -Werror; makes warnings fatal + | Opt_WarnDuplicateExports + | Opt_WarnHiShadows + | Opt_WarnIncompletePatterns + | Opt_WarnIncompletePatternsRecUpd + | Opt_WarnMissingFields + | Opt_WarnMissingMethods + | Opt_WarnMissingSigs + | Opt_WarnNameShadowing + | Opt_WarnOverlappingPatterns + | Opt_WarnSimplePatterns + | Opt_WarnTypeDefaults + | Opt_WarnUnusedBinds + | Opt_WarnUnusedImports + | Opt_WarnUnusedMatches + | Opt_WarnDeprecations + | Opt_WarnDodgyImports -- language opts | Opt_AllowOverlappingInstances | Opt_AllowUndecidableInstances + | Opt_AllowIncoherentInstances + | Opt_NoMonomorphismRestriction | Opt_GlasgowExts + | Opt_FFI + | Opt_PArr -- syntactic support for parallel arrays + | Opt_Arrows -- Arrow-notation syntax + | Opt_TH + | Opt_ImplicitParams + | Opt_Generics + | Opt_NoImplicitPrelude + + -- optimisation opts + | Opt_Strictness + | Opt_FullLaziness + | Opt_CSE + | Opt_IgnoreInterfacePragmas + | Opt_OmitInterfacePragmas + | Opt_DoLambdaEtaExpansion + | Opt_IgnoreAsserts + | Opt_DoEtaReduction + | Opt_CaseMerge + | Opt_UnboxStrictFields + deriving (Eq) -newtype DynFlags = DynFlags (CoreToDo, StgToDo, [(DynFlag, SwitchResult)]) - -boolOpt :: DynFlag -> DynFlags -> Bool -boolOpt f (DynFlags (_, _, dflags)) - = case lookup f dflags of - Nothing -> False - Just (SwBool b) -> b - _ -> panic "boolOpt" - -dopt_D_dump_all = boolOpt Opt_D_dump_all -dopt_D_dump_most = boolOpt Opt_D_dump_most -dopt_D_dump_absC = boolOpt Opt_D_dump_absC -dopt_D_dump_asm = boolOpt Opt_D_dump_asm -dopt_D_dump_cpranal = boolOpt Opt_D_dump_cpranal -dopt_D_dump_deriv = boolOpt Opt_D_dump_deriv -dopt_D_dump_ds = boolOpt Opt_D_dump_ds -dopt_D_dump_flatC = boolOpt Opt_D_dump_flatC -dopt_D_dump_foreign = boolOpt Opt_D_dump_foreign -dopt_D_dump_inlinings = boolOpt Opt_D_dump_inlinings -dopt_D_dump_occur_anal = boolOpt Opt_D_dump_occur_anal -dopt_D_dump_parsed = boolOpt Opt_D_dump_parsed -dopt_D_dump_realC = boolOpt Opt_D_dump_realC -dopt_D_dump_rn = boolOpt Opt_D_dump_rn -dopt_D_dump_simpl = boolOpt Opt_D_dump_simpl -dopt_D_dump_simpl_iterations = boolOpt Opt_D_dump_simpl_iterations -dopt_D_dump_spec = boolOpt Opt_D_dump_spec -dopt_D_dump_stg = boolOpt Opt_D_dump_stg -dopt_D_dump_stranal = boolOpt Opt_D_dump_stranal -dopt_D_dump_tc = boolOpt Opt_D_dump_tc -dopt_D_dump_types = boolOpt Opt_D_dump_types -dopt_D_dump_rules = boolOpt Opt_D_dump_rules -dopt_D_dump_usagesp = boolOpt Opt_D_dump_usagesp -dopt_D_dump_cse = boolOpt Opt_D_dump_cse -dopt_D_dump_worker_wrapper = boolOpt Opt_D_dump_worker_wrapper -dopt_D_show_passes = boolOpt Opt_D_show_passes -dopt_D_dump_rn_trace = boolOpt Opt_D_dump_rn_trace -dopt_D_dump_rn_stats = boolOpt Opt_D_dump_rn_stats -dopt_D_dump_stix = boolOpt Opt_D_dump_stix -dopt_D_dump_simpl_stats = boolOpt Opt_D_dump_simpl_stats -dopt_D_source_stats = boolOpt Opt_D_source_stats -dopt_D_verbose_core2core = boolOpt Opt_D_verbose_core2core -dopt_D_verbose_stg2stg = boolOpt Opt_D_verbose_stg2stg -dopt_D_dump_hi_diffs = boolOpt Opt_D_dump_hi_diffs -dopt_D_dump_minimal_imports = boolOpt Opt_D_dump_minimal_imports -dopt_DoCoreLinting = boolOpt Opt_DoCoreLinting -dopt_DoStgLinting = boolOpt Opt_DoStgLinting -dopt_DoUSPLinting = boolOpt Opt_DoUSPLinting - -dopt_AllowOverlappingInstances = boolOpt Opt_AllowOverlappingInstances -dopt_AllowUndecidableInstances = boolOpt Opt_AllowUndecidableInstances -dopt_GlasgowExts = boolOpt Opt_GlasgowExts - -dopt_CoreToDo :: DynFlags -> CoreToDo -dopt_CoreToDo (DynFlags (core_todo,_,_)) = core_todo - -dopt_StgToDo :: DynFlags -> StgToDo -dopt_StgToDo (DynFlags (_,stg_todo,_)) = stg_todo +data DynFlags = DynFlags { + coreToDo :: Maybe [CoreToDo], -- reserved for use with -Ofile + stgToDo :: [StgToDo], + hscLang :: HscLang, + hscOutName :: String, -- name of the output file + hscStubHOutName :: String, -- name of the .stub_h output file + hscStubCOutName :: String, -- name of the .stub_c output file + extCoreName :: String, -- name of the .core output file + verbosity :: Int, -- verbosity level + optLevel :: Int, -- optimisation level + maxSimplIterations :: Int, -- max simplifier iterations + ruleCheck :: Maybe String, + cppFlag :: Bool, -- preprocess with cpp? + ppFlag :: Bool, -- preprocess with a Haskell Pp? + stolen_x86_regs :: Int, + cmdlineHcIncludes :: [String], -- -#includes + importPaths :: [FilePath], + + -- options for particular phases + opt_L :: [String], + opt_P :: [String], + opt_F :: [String], + opt_c :: [String], + opt_a :: [String], + opt_m :: [String], +#ifdef ILX + opt_I :: [String], + opt_i :: [String], +#endif + + -- ** Package flags + extraPkgConfs :: [FilePath], + -- The -package-conf flags given on the command line, in the order + -- they appeared. + + readUserPkgConf :: Bool, + -- Whether or not to read the user package database + -- (-no-user-package-conf). + + packageFlags :: [PackageFlag], + -- The -package and -hide-package flags from the command-line + + -- ** Package state + pkgState :: PackageState, + + -- hsc dynamic flags + flags :: [DynFlag] + } + +data PackageFlag + = ExposePackage String + | HidePackage String + | IgnorePackage String + +data HscLang + = HscC + | HscAsm + | HscJava + | HscILX + | HscInterpreted + | HscNothing + deriving (Eq, Show) + +defaultHscLang + | cGhcWithNativeCodeGen == "YES" && + (prefixMatch "i386" cTARGETPLATFORM || + prefixMatch "sparc" cTARGETPLATFORM || + prefixMatch "powerpc" cTARGETPLATFORM) = HscAsm + | otherwise = HscC + +defaultDynFlags = DynFlags { + coreToDo = Nothing, stgToDo = [], + hscLang = defaultHscLang, + hscOutName = "", + hscStubHOutName = "", hscStubCOutName = "", + extCoreName = "", + verbosity = 0, + optLevel = 0, + maxSimplIterations = 4, + ruleCheck = Nothing, + cppFlag = False, + ppFlag = False, + stolen_x86_regs = 4, + cmdlineHcIncludes = [], + importPaths = ["."], + opt_L = [], + opt_P = [], + opt_F = [], + opt_c = [], + opt_a = [], + opt_m = [], +#ifdef ILX + opt_I = [], + opt_i = [], +#endif + + extraPkgConfs = [], + readUserPkgConf = True, + packageFlags = [], + pkgState = error "pkgState", + + flags = [ + Opt_Generics, + -- Generating the helper-functions for + -- generics is now on by default + Opt_Strictness, + -- strictness is on by default, but this only + -- applies to -O. + Opt_CSE, -- similarly for CSE. + Opt_FullLaziness, -- ...and for full laziness + + Opt_DoLambdaEtaExpansion, + -- This one is important for a tiresome reason: + -- we want to make sure that the bindings for data + -- constructors are eta-expanded. This is probably + -- a good thing anyway, but it seems fragile. + + -- and the default no-optimisation options: + Opt_IgnoreInterfacePragmas, + Opt_OmitInterfacePragmas + + ] ++ standardWarnings + } + +{- + Verbosity levels: + + 0 | print errors & warnings only + 1 | minimal verbosity: print "compiling M ... done." for each module. + 2 | equivalent to -dshow-passes + 3 | equivalent to existing "ghc -v" + 4 | "ghc -v -ddump-most" + 5 | "ghc -v -ddump-all" +-} + +dopt :: DynFlag -> DynFlags -> Bool +dopt f dflags = f `elem` (flags dflags) + +dopt_CoreToDo :: DynFlags -> Maybe [CoreToDo] +dopt_CoreToDo = coreToDo + +dopt_StgToDo :: DynFlags -> [StgToDo] +dopt_StgToDo = stgToDo + +dopt_OutName :: DynFlags -> String +dopt_OutName = hscOutName + +dopt_HscLang :: DynFlags -> HscLang +dopt_HscLang = hscLang + +dopt_set :: DynFlags -> DynFlag -> DynFlags +dopt_set dfs f = dfs{ flags = f : flags dfs } + +dopt_unset :: DynFlags -> DynFlag -> DynFlags +dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) } + +getOpts :: DynFlags -> (DynFlags -> [a]) -> [a] + -- We add to the options from the front, so we need to reverse the list +getOpts dflags opts = reverse (opts dflags) + +getVerbFlag dflags + | verbosity dflags >= 3 = "-v" + | otherwise = "" + +----------------------------------------------------------------------------- +-- Setting the optimisation level + +updOptLevel n dfs + = if (n >= 1) + then dfs2{ hscLang = HscC, optLevel = n } -- turn on -fvia-C with -O + else dfs2{ optLevel = n } + where + dfs1 = foldr (flip dopt_unset) dfs remove_dopts + dfs2 = foldr (flip dopt_set) dfs1 extra_dopts + + extra_dopts + | n == 0 = opt_0_dopts + | otherwise = opt_1_dopts + + remove_dopts + | n == 0 = opt_1_dopts + | otherwise = opt_0_dopts + +opt_0_dopts = [ + Opt_IgnoreInterfacePragmas, + Opt_OmitInterfacePragmas + ] + +opt_1_dopts = [ + Opt_IgnoreAsserts, + Opt_DoEtaReduction, + Opt_CaseMerge + ] + +-- Core-to-core phases: + +buildCoreToDo :: DynFlags -> [CoreToDo] +buildCoreToDo dflags = core_todo + where + opt_level = optLevel dflags + max_iter = maxSimplIterations dflags + strictness = dopt Opt_Strictness dflags + full_laziness = dopt Opt_FullLaziness dflags + cse = dopt Opt_CSE dflags + rule_check = ruleCheck dflags + + core_todo = + if opt_level == 0 then + [ + CoreDoSimplify (SimplPhase 0) [ + MaxSimplifierIterations max_iter + ] + ] + + else {- opt_level >= 1 -} [ + + -- initial simplify: mk specialiser happy: minimum effort please + CoreDoSimplify SimplGently [ + -- Simplify "gently" + -- Don't inline anything till full laziness has bitten + -- In particular, inlining wrappers inhibits floating + -- e.g. ...(case f x of ...)... + -- ==> ...(case (case x of I# x# -> fw x#) of ...)... + -- ==> ...(case x of I# x# -> case fw x# of ...)... + -- and now the redex (f x) isn't floatable any more + -- Similarly, don't apply any rules until after full + -- laziness. Notably, list fusion can prevent floating. + + NoCaseOfCase, + -- Don't do case-of-case transformations. + -- This makes full laziness work better + MaxSimplifierIterations max_iter + ], + + -- Specialisation is best done before full laziness + -- so that overloaded functions have all their dictionary lambdas manifest + CoreDoSpecialising, + + if full_laziness then CoreDoFloatOutwards (FloatOutSw False False) + else CoreDoNothing, + + CoreDoFloatInwards, + + CoreDoSimplify (SimplPhase 2) [ + -- Want to run with inline phase 2 after the specialiser to give + -- maximum chance for fusion to work before we inline build/augment + -- in phase 1. This made a difference in 'ansi' where an + -- overloaded function wasn't inlined till too late. + MaxSimplifierIterations max_iter + ], + case rule_check of { Just pat -> CoreDoRuleCheck 2 pat; Nothing -> CoreDoNothing }, + + CoreDoSimplify (SimplPhase 1) [ + -- Need inline-phase2 here so that build/augment get + -- inlined. I found that spectral/hartel/genfft lost some useful + -- strictness in the function sumcode' if augment is not inlined + -- before strictness analysis runs + MaxSimplifierIterations max_iter + ], + case rule_check of { Just pat -> CoreDoRuleCheck 1 pat; Nothing -> CoreDoNothing }, + + CoreDoSimplify (SimplPhase 0) [ + -- Phase 0: allow all Ids to be inlined now + -- This gets foldr inlined before strictness analysis + + MaxSimplifierIterations 3 + -- At least 3 iterations because otherwise we land up with + -- huge dead expressions because of an infelicity in the + -- simpifier. + -- let k = BIG in foldr k z xs + -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs + -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs + -- Don't stop now! + + ], + case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing }, + +#ifdef OLD_STRICTNESS + CoreDoOldStrictness +#endif + if strictness then CoreDoStrictness else CoreDoNothing, + CoreDoWorkerWrapper, + CoreDoGlomBinds, + + CoreDoSimplify (SimplPhase 0) [ + MaxSimplifierIterations max_iter + ], + + if full_laziness then + CoreDoFloatOutwards (FloatOutSw False -- Not lambdas + True) -- Float constants + else CoreDoNothing, + -- nofib/spectral/hartel/wang doubles in speed if you + -- do full laziness late in the day. It only happens + -- after fusion and other stuff, so the early pass doesn't + -- catch it. For the record, the redex is + -- f_el22 (f_el21 r_midblock) + + + -- We want CSE to follow the final full-laziness pass, because it may + -- succeed in commoning up things floated out by full laziness. + -- CSE used to rely on the no-shadowing invariant, but it doesn't any more + + if cse then CoreCSE else CoreDoNothing, + + CoreDoFloatInwards, + +-- Case-liberation for -O2. This should be after +-- strictness analysis and the simplification which follows it. + + case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing }, + + if opt_level >= 2 then + CoreLiberateCase + else + CoreDoNothing, + if opt_level >= 2 then + CoreDoSpecConstr + else + CoreDoNothing, + + -- Final clean-up simplification: + CoreDoSimplify (SimplPhase 0) [ + MaxSimplifierIterations max_iter + ] + ] +\end{code} + +%************************************************************************ +%* * +\subsection{Warnings} +%* * +%************************************************************************ + +\begin{code} +standardWarnings + = [ Opt_WarnDeprecations, + Opt_WarnOverlappingPatterns, + Opt_WarnMissingFields, + Opt_WarnMissingMethods, + Opt_WarnDuplicateExports + ] + +minusWOpts + = standardWarnings ++ + [ Opt_WarnUnusedBinds, + Opt_WarnUnusedMatches, + Opt_WarnUnusedImports, + Opt_WarnIncompletePatterns, + Opt_WarnDodgyImports + ] + +minusWallOpts + = minusWOpts ++ + [ Opt_WarnTypeDefaults, + Opt_WarnNameShadowing, + Opt_WarnMissingSigs, + Opt_WarnHiShadows + ] \end{code} %************************************************************************ @@ -385,33 +657,47 @@ dopt_StgToDo (DynFlags (_,stg_todo,_)) = stg_todo %************************************************************************ \begin{code} -lookUp :: FAST_STRING -> Bool -lookup_int :: String -> Maybe Int +-- v_Statis_hsc_opts is here to avoid a circular dependency with +-- main/DriverState. +GLOBAL_VAR(v_Static_hsc_opts, [], [String]) + +lookUp :: FastString -> Bool lookup_def_int :: String -> Int -> Int lookup_def_float :: String -> Float -> Float lookup_str :: String -> Maybe String -lookUp sw = sw `elem` argv - -lookup_str sw = firstJust (map (startsWith sw) unpacked_opts) +unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts) +packed_static_opts = map mkFastString unpacked_static_opts -lookup_int sw = case (lookup_str sw) of - Nothing -> Nothing - Just xx -> Just (read xx) +lookUp sw = sw `elem` packed_static_opts + +-- (lookup_str "foo") looks for the flag -foo=X or -fooX, +-- and returns the string X +lookup_str sw + = case firstJust (map (startsWith sw) unpacked_static_opts) of + Just ('=' : str) -> Just str + Just str -> Just str + Nothing -> Nothing lookup_def_int sw def = case (lookup_str sw) of Nothing -> def -- Use default - Just xx -> read xx - -lookup_def_char sw def = case (lookup_str sw) of - Just (xx:_) -> xx - _ -> def -- Use default + Just xx -> try_read sw xx lookup_def_float sw def = case (lookup_str sw) of Nothing -> def -- Use default - Just xx -> read xx + Just xx -> try_read sw xx + + +try_read :: Read a => String -> String -> a +-- (try_read sw str) tries to read s; if it fails, it +-- bleats about flag sw +try_read sw str + = case reads str of + ((x,_):_) -> x -- Be forgiving: ignore trailing goop, and alternative parses + [] -> ghcError (UsageError ("Malformed argument " ++ str ++ " for flag " ++ sw)) + -- ToDo: hack alert. We should really parse the arugments + -- and announce errors in a more civilised way. -unpacked_opts = map _UNPK_ argv {- Putting the compiler options into temporary at-files @@ -423,7 +709,7 @@ unpacked_opts :: [String] unpacked_opts = concat $ map (expandAts) $ - map _UNPK_ argv + map unpackFS argv -- NOT ARGV any more: v_Static_hsc_opts where expandAts ('@':fname) = words (unsafePerformIO (readFile fname)) expandAts l = [l] @@ -438,307 +724,120 @@ unpacked_opts = \begin{code} -- debugging opts -opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags") -opt_PprStyle_Debug = lookUp SLIT("-dppr-debug") +opt_PprStyle_Debug = lookUp FSLIT("-dppr-debug") opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name --- warning opts -opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports") -opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing") -opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns") -opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields") -opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods") -opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures") -opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing") -opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns") -opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns") -opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults") -opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds") -opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports") -opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches") -opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations") - -- profiling opts -opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs") -opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs") -opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs") -opt_AutoSccsOnDicts = lookUp SLIT("-fauto-sccs-on-dicts") -opt_SccProfilingOn = lookUp SLIT("-fscc-profiling") -opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky") +opt_AutoSccsOnAllToplevs = lookUp FSLIT("-fauto-sccs-on-all-toplevs") +opt_AutoSccsOnExportedToplevs = lookUp FSLIT("-fauto-sccs-on-exported-toplevs") +opt_AutoSccsOnIndividualCafs = lookUp FSLIT("-fauto-sccs-on-individual-cafs") +opt_SccProfilingOn = lookUp FSLIT("-fscc-profiling") +opt_DoTickyProfiling = lookUp FSLIT("-fticky-ticky") -- language opts -opt_AllStrict = lookUp SLIT("-fall-strict") -opt_DictsStrict = lookUp SLIT("-fdicts-strict") -opt_Generics = lookUp SLIT("-fgenerics") -opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples") +opt_AllStrict = lookUp FSLIT("-fall-strict") +opt_DictsStrict = lookUp FSLIT("-fdicts-strict") +opt_IrrefutableTuples = lookUp FSLIT("-firrefutable-tuples") opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH -opt_NumbersStrict = lookUp SLIT("-fnumbers-strict") -opt_Parallel = lookUp SLIT("-fparallel") -opt_SMP = lookUp SLIT("-fsmp") +opt_Parallel = lookUp FSLIT("-fparallel") +opt_SMP = lookUp FSLIT("-fsmp") +opt_Flatten = lookUp FSLIT("-fflatten") -- optimisation opts -opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging") -opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on") +opt_NoStateHack = lookUp FSLIT("-fno-state-hack") +opt_NoMethodSharing = lookUp FSLIT("-fno-method-sharing") +opt_CprOff = lookUp FSLIT("-fcpr-off") +opt_RulesOff = lookUp FSLIT("-frules-off") + -- Switch off CPR analysis in the new demand analyser opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" (10::Int) -opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape") -opt_UnfoldCasms = lookUp SLIT("-funfold-casms-in-hi-file") -opt_UsageSPOn = lookUp SLIT("-fusagesp-on") -opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields") +opt_MaxWorkerArgs = lookup_def_int "-fmax-worker-args" (10::Int) -{- - The optional '-inpackage=P' flag tells what package - we are compiling this module for. - The Prelude, for example is compiled with '-package prelude' --} -opt_InPackage = case lookup_str "-inpackage=" of - Just p -> _PK_ p - Nothing -> SLIT("Main") -- The package name if none is specified - -opt_EmitCExternDecls = lookUp SLIT("-femit-extern-decls") -opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names") -opt_GranMacros = lookUp SLIT("-fgransim") -opt_HiVersion = lookup_def_int "-fhi-version=" 0 -- what version we're compiling. +opt_EmitCExternDecls = lookUp FSLIT("-femit-extern-decls") +opt_EnsureSplittableC = lookUp FSLIT("-fglobalise-toplev-names") +opt_GranMacros = lookUp FSLIT("-fgransim") +opt_HiVersion = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int opt_HistorySize = lookup_def_int "-fhistory-size" 20 -opt_IgnoreAsserts = lookUp SLIT("-fignore-asserts") -opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas") -opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check") -opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude") -opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing") -opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas") -opt_ProduceExportCStubs = lookup_str "-F=" -opt_ProduceExportHStubs = lookup_str "-FH=" - --- Language for output: "C", "asm", "java", maybe more --- Nothing => don't output anything -opt_OutputLanguage :: Maybe String -opt_OutputLanguage = lookup_str "-olang=" - -opt_OutputFile :: String -opt_OutputFile = case lookup_str "-ofile=" of - Nothing -> panic "No output file specified (-ofile=xxx)" - Just f -> f +opt_OmitBlackHoling = lookUp FSLIT("-dno-black-holing") +opt_RuntimeTypes = lookUp FSLIT("-fruntime-types") -- Simplifier switches -opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining") +opt_SimplNoPreInlining = lookUp FSLIT("-fno-pre-inlining") -- NoPreInlining is there just to see how bad things -- get if you don't do it! -opt_SimplDoEtaReduction = lookUp SLIT("-fdo-eta-reduction") -opt_SimplDoLambdaEtaExpansion = lookUp SLIT("-fdo-lambda-eta-expansion") -opt_SimplCaseOfCase = lookUp SLIT("-fcase-of-case") -opt_SimplCaseMerge = lookUp SLIT("-fcase-merge") -opt_SimplPedanticBottoms = lookUp SLIT("-fpedantic-bottoms") -opt_SimplExcessPrecision = lookUp SLIT("-fexcess-precision") +opt_SimplExcessPrecision = lookUp FSLIT("-fexcess-precision") -- Unfolding control -opt_UF_HiFileThreshold = lookup_def_int "-funfolding-interface-threshold" (45::Int) opt_UF_CreationThreshold = lookup_def_int "-funfolding-creation-threshold" (45::Int) opt_UF_UseThreshold = lookup_def_int "-funfolding-use-threshold" (8::Int) -- Discounts can be big opt_UF_FunAppDiscount = lookup_def_int "-funfolding-fun-discount" (6::Int) -- It's great to inline a fn opt_UF_KeenessFactor = lookup_def_float "-funfolding-keeness-factor" (1.5::Float) -opt_UF_UpdateInPlace = lookUp SLIT("-funfolding-update-in-place") +opt_UF_UpdateInPlace = lookUp FSLIT("-funfolding-update-in-place") -opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for opt_UF_DearOp = ( 4 :: Int) -opt_ReportCompile = lookUp SLIT("-freport-compile") -opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls") -opt_NoPruneTyDecls = lookUp SLIT("-fno-prune-tydecls") -opt_Static = lookUp SLIT("-static") -opt_Unregisterised = lookUp SLIT("-funregisterised") -opt_Verbose = lookUp SLIT("-v") - -opt_UseVanillaRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Vanilla_REG -opt_UseFloatRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Float_REG -opt_UseDoubleRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Double_REG -opt_UseLongRegs | opt_Unregisterised = 0 - | otherwise = mAX_Real_Long_REG -\end{code} +opt_Static = lookUp FSLIT("-static") +opt_Unregisterised = lookUp FSLIT("-funregisterised") +opt_EmitExternalCore = lookUp FSLIT("-fext-core") -\begin{code} -classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec - [StgToDo]) -- STG-to-STG processing spec +-- Include full span info in error messages, instead of just the start position. +opt_ErrorSpans = lookUp FSLIT("-ferror-spans") -classifyOpts = sep argv [] [] -- accumulators... - where - sep :: [FAST_STRING] -- cmd-line opts (input) - -> [CoreToDo] -> [StgToDo] -- to_do accumulators - -> ([CoreToDo], [StgToDo]) -- result - - sep [] core_td stg_td -- all done! - = (reverse core_td, reverse stg_td) - -# define CORE_TD(to_do) sep opts (to_do:core_td) stg_td -# define STG_TD(to_do) sep opts core_td (to_do:stg_td) - - sep (opt1:opts) core_td stg_td - = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end... - ',' : _ -> sep opts core_td stg_td -- it is for the parser - - "-fsimplify" -> -- gather up SimplifierSwitches specially... - simpl_sep opts defaultSimplSwitches core_td stg_td - - "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards) - "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False) - "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True) - "-fliberate-case" -> CORE_TD(CoreLiberateCase) - "-fcse" -> CORE_TD(CoreCSE) - "-fglom-binds" -> CORE_TD(CoreDoGlomBinds) - "-fprint-core" -> CORE_TD(CoreDoPrintCore) - "-fstatic-args" -> CORE_TD(CoreDoStaticArgs) - "-fstrictness" -> CORE_TD(CoreDoStrictness) - "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper) - "-fspecialise" -> CORE_TD(CoreDoSpecialising) - "-fusagesp" -> CORE_TD(CoreDoUSPInf) - "-fcpr-analyse" -> CORE_TD(CoreDoCPResult) - - "-fstg-static-args" -> STG_TD(StgDoStaticArgs) - "-dstg-stats" -> STG_TD(D_stg_stats) - "-flambda-lift" -> STG_TD(StgDoLambdaLift) - "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling) - - _ -> -- NB: the driver is really supposed to handle bad options - sep opts core_td stg_td - - ---------------- - - simpl_sep :: [FAST_STRING] -- cmd-line opts (input) - -> [SimplifierSwitch] -- simplifier-switch accumulator - -> [CoreToDo] -> [StgToDo] -- to_do accumulators - -> ([CoreToDo], [StgToDo]) -- result - - -- "simpl_sep" tailcalls "sep" once it's seen one set - -- of SimplifierSwitches for a CoreDoSimplify. - -#ifdef DEBUG - simpl_sep input@[] simpl_sw core_td stg_td - = panic "simpl_sep []" -#endif - - -- The SimplifierSwitches should be delimited by "[" and "]". - - simpl_sep (opt1:opts) simpl_sw core_td stg_td - = case (_UNPK_ opt1) of - "[" -> simpl_sep opts simpl_sw core_td stg_td - "]" -> let - this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw) - in - sep opts (this_simpl : core_td) stg_td - - opt -> case matchSimplSw opt of - Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td - Nothing -> simpl_sep opts simpl_sw core_td stg_td - -matchSimplSw opt - = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations - , matchSwInt opt "-finline-phase" SimplInlinePhase - , matchSwBool opt "-fno-rules" DontApplyRules - , matchSwBool opt "-fno-case-of-case" NoCaseOfCase - , matchSwBool opt "-flet-to-case" SimplLetToCase - ] - -matchSwBool :: String -> String -> a -> Maybe a -matchSwBool opt str sw | opt == str = Just sw - | otherwise = Nothing - -matchSwInt :: String -> String -> (Int -> a) -> Maybe a -matchSwInt opt str sw = case startsWith str opt of - Just opt_left -> Just (sw (read opt_left)) - Nothing -> Nothing +opt_PIC = lookUp FSLIT("-fPIC") \end{code} %************************************************************************ %* * -\subsection{Switch ordering} +\subsection{List of static hsc flags} %* * %************************************************************************ -In spite of the @Produce*@ constructor, these things behave just like -enumeration types. - \begin{code} -instance Eq SimplifierSwitch where - a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b - -instance Ord SimplifierSwitch where - a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b - a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b - - -tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1) -tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2) -tagOf_SimplSwitch DontApplyRules = ILIT(3) -tagOf_SimplSwitch SimplLetToCase = ILIT(4) -tagOf_SimplSwitch NoCaseOfCase = ILIT(5) - --- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too! - -lAST_SIMPL_SWITCH_TAG = 5 -\end{code} - -%************************************************************************ -%* * -\subsection{Switch lookup} -%* * -%************************************************************************ - -\begin{code} -isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult - -isAmongSimpl on_switches -- Switches mentioned later occur *earlier* - -- in the list; defaults right at the end. - = let - tidied_on_switches = foldl rm_dups [] on_switches - -- The fold*l* ensures that we keep the latest switches; - -- ie the ones that occur earliest in the list. - - sw_tbl :: Array Int SwitchResult - sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds... - all_undefined) - // defined_elems - - all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ] - - defined_elems = map mk_assoc_elem tidied_on_switches - in - -- (avoid some unboxing, bounds checking, and other horrible things:) -#if __GLASGOW_HASKELL__ < 405 - case sw_tbl of { Array bounds_who_needs_'em stuff -> -#else - case sw_tbl of { Array _ _ stuff -> -#endif - \ switch -> - case (indexArray# stuff (tagOf_SimplSwitch switch)) of -#if __GLASGOW_HASKELL__ < 400 - Lift v -> v -#elif __GLASGOW_HASKELL__ < 403 - (# _, v #) -> v -#else - (# v #) -> v -#endif - } - where - mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl) - mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n) - mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom! - - -- cannot have duplicates if we are going to use the array thing - rm_dups switches_so_far switch - = if switch `is_elem` switches_so_far - then switches_so_far - else switch : switches_so_far - where - sw `is_elem` [] = False - sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s) - || sw `is_elem` ss -\end{code} - -Default settings for simplifier switches - -\begin{code} -defaultSimplSwitches = [MaxSimplifierIterations 1] +isStaticHscFlag f = + f `elem` [ + "fauto-sccs-on-all-toplevs", + "fauto-sccs-on-exported-toplevs", + "fauto-sccs-on-individual-cafs", + "fauto-sccs-on-dicts", + "fscc-profiling", + "fticky-ticky", + "fall-strict", + "fdicts-strict", + "firrefutable-tuples", + "fparallel", + "fsmp", + "fflatten", + "fsemi-tagging", + "flet-no-escape", + "femit-extern-decls", + "fglobalise-toplev-names", + "fgransim", + "fno-hi-version-check", + "dno-black-holing", + "fno-method-sharing", + "fno-state-hack", + "fruntime-types", + "fno-pre-inlining", + "fexcess-precision", + "funfolding-update-in-place", + "static", + "funregisterised", + "fext-core", + "frule-check", + "frules-off", + "fcpr-off", + "ferror-spans", + "fPIC" + ] + || any (flip prefixMatch f) [ + "fcontext-stack", + "fliberate-case-threshold", + "fmax-worker-args", + "fhistory-size", + "funfolding-creation-threshold", + "funfolding-use-threshold", + "funfolding-fun-discount", + "funfolding-keeness-factor" + ] \end{code} %************************************************************************ @@ -748,23 +847,6 @@ defaultSimplSwitches = [MaxSimplifierIterations 1] %************************************************************************ -\begin{code} -switchIsOn :: (switch -> SwitchResult) -> switch -> Bool - -switchIsOn lookup_fn switch - = case (lookup_fn switch) of - SwBool False -> False - _ -> True - -intSwitchSet :: (switch -> SwitchResult) - -> (Int -> switch) - -> Maybe Int - -intSwitchSet lookup_fn switch - = case (lookup_fn (switch (panic "intSwitchSet"))) of - SwInt int -> Just int - _ -> Nothing -\end{code} \begin{code} startsWith :: String -> String -> Maybe String