X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FdeSugar%2FDesugar.lhs;h=521d1ad401f9ed62086a520d158b1a0c65d27256;hp=f9e6212b18b8f0bbdaf57d0dff35702349034fdc;hb=f96194794bf099020706c3816d1a5678b40addbb;hpb=f6ff984bd9a556b547760fd09971fd5e023af189 diff --git a/compiler/deSugar/Desugar.lhs b/compiler/deSugar/Desugar.lhs index f9e6212..521d1ad 100644 --- a/compiler/deSugar/Desugar.lhs +++ b/compiler/deSugar/Desugar.lhs @@ -8,8 +8,6 @@ The Desugarer: turning HsSyn into Core. \begin{code} module Desugar ( deSugar, deSugarExpr ) where -#include "HsVersions.h" - import DynFlags import StaticFlags import HscTypes @@ -19,7 +17,6 @@ import MkIface import Id import Name import CoreSyn -import OccurAnal import PprCore import DsMonad import DsExpr @@ -39,8 +36,8 @@ import Outputable import SrcLoc import Maybes import FastString -import Pretty ( Doc ) import Coverage + import Data.IORef \end{code} @@ -51,7 +48,8 @@ import Data.IORef %************************************************************************ \begin{code} -deSugar :: HscEnv -> ModLocation -> TcGblEnv -> IO (Maybe ModGuts) +-- | Main entry point to the desugarer. +deSugar :: HscEnv -> ModLocation -> TcGblEnv -> IO (Messages, Maybe ModGuts) -- Can modify PCS by faulting in more declarations deSugar hsc_env @@ -66,7 +64,8 @@ deSugar hsc_env tcg_fix_env = fix_env, tcg_inst_env = inst_env, tcg_fam_inst_env = fam_inst_env, - tcg_deprecs = deprecs, + tcg_warns = warns, + tcg_anns = anns, tcg_binds = binds, tcg_fords = fords, tcg_rules = rules, @@ -79,26 +78,30 @@ deSugar hsc_env -- Desugar the program ; let export_set = availsToNameSet exports - ; let auto_scc = mkAutoScc mod export_set + ; let auto_scc = mkAutoScc dflags mod export_set ; let target = hscTarget dflags ; let hpcInfo = emptyHpcInfo other_hpc_info - ; mb_res <- case target of - HscNothing -> return (Just ([], [], NoStubs, hpcInfo, emptyModBreaks)) - _ -> do (binds_cvr,ds_hpc_info, modBreaks) - <- if (opt_Hpc - || target == HscInterpreted) - && (not (isHsBoot hsc_src)) - then addCoverageTicksToBinds dflags mod mod_loc (typeEnvTyCons type_env) binds - else return (binds, hpcInfo, emptyModBreaks) - initDs hsc_env mod rdr_env type_env $ do - { core_prs <- dsTopLHsBinds auto_scc binds_cvr - ; (ds_fords, foreign_prs) <- dsForeigns fords - ; let all_prs = foreign_prs ++ core_prs - ; ds_rules <- mapM dsRule rules - ; return (all_prs, catMaybes ds_rules, ds_fords, ds_hpc_info, modBreaks) - } + ; (msgs, mb_res) + <- case target of + HscNothing -> + return (emptyMessages, + Just ([], [], NoStubs, hpcInfo, emptyModBreaks)) + _ -> do + (binds_cvr,ds_hpc_info, modBreaks) + <- if (opt_Hpc + || target == HscInterpreted) + && (not (isHsBoot hsc_src)) + then addCoverageTicksToBinds dflags mod mod_loc (typeEnvTyCons type_env) binds + else return (binds, hpcInfo, emptyModBreaks) + initDs hsc_env mod rdr_env type_env $ do + core_prs <- dsTopLHsBinds auto_scc binds_cvr + (ds_fords, foreign_prs) <- dsForeigns fords + let all_prs = foreign_prs ++ core_prs + ds_rules <- mapM dsRule rules + return (all_prs, catMaybes ds_rules, ds_fords, ds_hpc_info, modBreaks) + ; case mb_res of { - Nothing -> return Nothing ; + Nothing -> return (msgs, Nothing) ; Just (all_prs, ds_rules, ds_fords,ds_hpc_info, modBreaks) -> do { -- Add export flags to bindings @@ -131,7 +134,8 @@ deSugar hsc_env mg_dir_imps = imp_mods imports, mg_rdr_env = rdr_env, mg_fix_env = fix_env, - mg_deprecs = deprecs, + mg_warns = warns, + mg_anns = anns, mg_types = type_env, mg_insts = insts, mg_fam_insts = fam_insts, @@ -144,43 +148,47 @@ deSugar hsc_env mg_modBreaks = modBreaks, mg_vect_info = noVectInfo } - ; return (Just mod_guts) + ; return (msgs, Just mod_guts) }}} -mkAutoScc :: Module -> NameSet -> AutoScc -mkAutoScc mod exports +mkAutoScc :: DynFlags -> Module -> NameSet -> AutoScc +mkAutoScc dflags mod exports | not opt_SccProfilingOn -- No profiling = NoSccs - | opt_AutoSccsOnAllToplevs -- Add auto-scc on all top-level things - = AddSccs mod (\_ -> True) - | opt_AutoSccsOnExportedToplevs -- Only on exported things + -- Add auto-scc on all top-level things + | dopt Opt_AutoSccsOnAllToplevs dflags + = AddSccs mod (\id -> not $ isDerivedOccName $ getOccName id) + -- See #1641. This is pretty yucky, but I can't see a better way + -- to identify compiler-generated Ids, and at least this should + -- catch them all. + -- Only on exported things + | dopt Opt_AutoSccsOnExportedToplevs dflags = AddSccs mod (\id -> idName id `elemNameSet` exports) | otherwise = NoSccs - deSugarExpr :: HscEnv -> Module -> GlobalRdrEnv -> TypeEnv -> LHsExpr Id - -> IO (Maybe CoreExpr) + -> IO (Messages, Maybe CoreExpr) -- Prints its own errors; returns Nothing if error occurred -deSugarExpr hsc_env this_mod rdr_env type_env tc_expr - = do { let dflags = hsc_dflags hsc_env - ; showPass dflags "Desugar" +deSugarExpr hsc_env this_mod rdr_env type_env tc_expr = do + let dflags = hsc_dflags hsc_env + showPass dflags "Desugar" - -- Do desugaring - ; mb_core_expr <- initDs hsc_env this_mod rdr_env type_env $ - dsLExpr tc_expr + -- Do desugaring + (msgs, mb_core_expr) <- initDs hsc_env this_mod rdr_env type_env $ + dsLExpr tc_expr - ; case mb_core_expr of { - Nothing -> return Nothing ; - Just expr -> do { + case mb_core_expr of + Nothing -> return (msgs, Nothing) + Just expr -> do - -- Dump output - dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr expr) + -- Dump output + dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr expr) - ; return (Just expr) } } } + return (msgs, Just expr) -- addExportFlags -- Set the no-discard flag if either @@ -232,10 +240,10 @@ addExportFlags target exports keep_alive prs rules is_exported | target == HscInterpreted = isExternalName | otherwise = (`elemNameSet` exports) -ppr_ds_rules :: [CoreRule] -> PprStyle -> Doc +ppr_ds_rules :: [CoreRule] -> SDoc ppr_ds_rules [] = empty ppr_ds_rules rules - = text "" $$ text "-------------- DESUGARED RULES -----------------" $$ + = blankLine $$ text "-------------- DESUGARED RULES -----------------" $$ pprRules rules \end{code} @@ -251,16 +259,16 @@ ppr_ds_rules rules dsRule :: LRuleDecl Id -> DsM (Maybe CoreRule) dsRule (L loc (HsRule name act vars lhs _tv_lhs rhs _fv_rhs)) = putSrcSpanDs loc $ - do { let bndrs = [var | RuleBndr (L _ var) <- vars] + do { let bndrs' = [var | RuleBndr (L _ var) <- vars] ; lhs' <- dsLExpr lhs ; rhs' <- dsLExpr rhs - ; case decomposeRuleLhs (occurAnalyseExpr lhs') of { - Nothing -> do { warnDs msg; return Nothing } ; - Just (fn_id, args) -> do - -- Substitute the dict bindings eagerly, -- and take the body apart into a (f args) form + ; case decomposeRuleLhs (mkLams bndrs' lhs') of { + Nothing -> do { warnDs msg; return Nothing } ; + Just (bndrs, fn_id, args) -> do + { let local_rule = isLocalId fn_id -- NB: isLocalId is False of implicit Ids. This is good becuase -- we don't want to attach rules to the bindings of implicit Ids, @@ -274,6 +282,6 @@ dsRule (L loc (HsRule name act vars lhs _tv_lhs rhs _fv_rhs)) ; return (Just rule) } } } where - msg = hang (ptext SLIT("RULE left-hand side too complicated to desugar; ignored")) + msg = hang (ptext (sLit "RULE left-hand side too complicated to desugar; ignored")) 2 (ppr lhs) \end{code}