X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FdeSugar%2FDesugar.lhs;h=521d1ad401f9ed62086a520d158b1a0c65d27256;hp=7b3847ecdec53583d433a892c49e190273919ca7;hb=f96194794bf099020706c3816d1a5678b40addbb;hpb=61d2625ae2e6a4cdae2ffc92df828905e81c24cc diff --git a/compiler/deSugar/Desugar.lhs b/compiler/deSugar/Desugar.lhs index 7b3847e..521d1ad 100644 --- a/compiler/deSugar/Desugar.lhs +++ b/compiler/deSugar/Desugar.lhs @@ -1,51 +1,44 @@ % +% (c) The University of Glasgow 2006 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % -\section[Desugar]{@deSugar@: the main function} + +The Desugarer: turning HsSyn into Core. \begin{code} module Desugar ( deSugar, deSugarExpr ) where -#include "HsVersions.h" - -import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) ) -import StaticFlags ( opt_SccProfilingOn ) -import DriverPhases ( isHsBoot ) -import HscTypes ( ModGuts(..), HscEnv(..), - Dependencies(..), ForeignStubs(..), TypeEnv, IsBootInterface ) -import HsSyn ( RuleDecl(..), RuleBndr(..), LHsExpr, LRuleDecl ) -import TcRnTypes ( TcGblEnv(..), ImportAvails(..) ) -import MkIface ( mkUsageInfo ) -import Id ( Id, setIdExported, idName ) -import Name ( Name, isExternalName, nameIsLocalOrFrom, nameOccName ) +import DynFlags +import StaticFlags +import HscTypes +import HsSyn +import TcRnTypes +import MkIface +import Id +import Name import CoreSyn -import PprCore ( pprRules, pprCoreExpr ) +import PprCore import DsMonad -import DsExpr ( dsLExpr ) -import DsBinds ( dsTopLHsBinds, decomposeRuleLhs, AutoScc(..) ) -import DsForeign ( dsForeigns ) +import DsExpr +import DsBinds +import DsForeign import DsExpr () -- Forces DsExpr to be compiled; DsBinds only -- depends on DsExpr.hi-boot. import Module -import UniqFM ( eltsUFM, delFromUFM ) -import PackageConfig ( thPackageId ) -import RdrName ( GlobalRdrEnv ) +import RdrName import NameSet import VarSet -import Bag ( Bag, isEmptyBag, emptyBag ) -import Rules ( roughTopNames ) -import CoreLint ( showPass, endPass ) -import CoreFVs ( ruleRhsFreeVars, exprsFreeNames ) -import ErrUtils ( doIfSet, dumpIfSet_dyn, printBagOfWarnings, - errorsFound, WarnMsg ) -import ListSetOps ( insertList ) +import Rules +import CoreLint +import CoreFVs +import ErrUtils import Outputable -import UniqSupply ( mkSplitUniqSupply ) -import SrcLoc ( Located(..) ) -import DATA_IOREF ( readIORef ) -import Maybes ( catMaybes ) +import SrcLoc +import Maybes import FastString -import Util ( sortLe ) +import Coverage + +import Data.IORef \end{code} %************************************************************************ @@ -55,50 +48,66 @@ import Util ( sortLe ) %************************************************************************ \begin{code} -deSugar :: HscEnv -> TcGblEnv -> IO (Bag WarnMsg, 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 - tcg_env@(TcGblEnv { tcg_mod = mod, - tcg_src = hsc_src, - tcg_type_env = type_env, - tcg_imports = imports, - tcg_exports = exports, - tcg_dus = dus, - tcg_inst_uses = dfun_uses_var, - tcg_th_used = th_var, - tcg_keep = keep_var, - tcg_rdr_env = rdr_env, - tcg_fix_env = fix_env, - tcg_deprecs = deprecs, - tcg_binds = binds, - tcg_fords = fords, - tcg_rules = rules, - tcg_insts = insts }) - = do { showPass dflags "Desugar" + mod_loc + tcg_env@(TcGblEnv { tcg_mod = mod, + tcg_src = hsc_src, + tcg_type_env = type_env, + tcg_imports = imports, + tcg_exports = exports, + tcg_keep = keep_var, + tcg_rdr_env = rdr_env, + tcg_fix_env = fix_env, + tcg_inst_env = inst_env, + tcg_fam_inst_env = fam_inst_env, + tcg_warns = warns, + tcg_anns = anns, + tcg_binds = binds, + tcg_fords = fords, + tcg_rules = rules, + tcg_insts = insts, + tcg_fam_insts = fam_insts, + tcg_hpc = other_hpc_info }) + + = do { let dflags = hsc_dflags hsc_env + ; showPass dflags "Desugar" -- Desugar the program - ; ((all_prs, ds_rules, ds_fords), warns) - <- case ghcMode (hsc_dflags hsc_env) of - JustTypecheck -> return (([], [], NoStubs), emptyBag) - _ -> initDs hsc_env mod rdr_env type_env $ do - { core_prs <- dsTopLHsBinds auto_scc binds - ; (ds_fords, foreign_prs) <- dsForeigns fords - ; let all_prs = foreign_prs ++ core_prs - local_bndrs = mkVarSet (map fst all_prs) - ; ds_rules <- mappM (dsRule mod local_bndrs) rules - ; return (all_prs, catMaybes ds_rules, ds_fords) - } - - -- If warnings are considered errors, leave. - ; if errorsFound dflags (warns, emptyBag) - then return (warns, Nothing) - else do + ; let export_set = availsToNameSet exports + ; let auto_scc = mkAutoScc dflags mod export_set + ; let target = hscTarget dflags + ; let hpcInfo = emptyHpcInfo other_hpc_info + ; (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 (msgs, Nothing) ; + Just (all_prs, ds_rules, ds_fords,ds_hpc_info, modBreaks) -> do { -- Add export flags to bindings keep_alive <- readIORef keep_var - ; let final_prs = addExportFlags ghci_mode exports keep_alive - all_prs ds_rules + ; let final_prs = addExportFlags target export_set + keep_alive all_prs ds_rules ds_binds = [Rec final_prs] -- Notice that we put the whole lot in a big Rec, even the foreign binds -- When compiling PrelFloat, which defines data Float = F# Float# @@ -113,92 +122,73 @@ deSugar hsc_env ; doIfSet (dopt Opt_D_dump_ds dflags) (printDump (ppr_ds_rules ds_rules)) - ; dfun_uses <- readIORef dfun_uses_var -- What dfuns are used - ; th_used <- readIORef th_var -- Whether TH is used - ; let used_names = allUses dus `unionNameSets` dfun_uses - pkgs | th_used = insertList thPackageId (imp_dep_pkgs imports) - | otherwise = imp_dep_pkgs imports - - dep_mods = eltsUFM (delFromUFM (imp_dep_mods imports) (moduleName mod)) - -- M.hi-boot can be in the imp_dep_mods, but we must remove - -- it before recording the modules on which this one depends! - -- (We want to retain M.hi-boot in imp_dep_mods so that - -- loadHiBootInterface can see if M's direct imports depend - -- on M.hi-boot, and hence that we should do the hi-boot consistency - -- check.) - - dir_imp_mods = imp_mods imports - - ; showPass dflags "Desugar 3" - - ; usages <- mkUsageInfo hsc_env dir_imp_mods dep_mods used_names - - ; showPass dflags "Desugar 4" - - ; let - -- Modules don't compare lexicographically usually, - -- but we want them to do so here. - le_mod :: Module -> Module -> Bool - le_mod m1 m2 = moduleNameFS (moduleName m1) - <= moduleNameFS (moduleName m2) - le_dep_mod :: (ModuleName, IsBootInterface) -> (ModuleName, IsBootInterface) -> Bool - le_dep_mod (m1,_) (m2,_) = moduleNameFS m1 <= moduleNameFS m2 - - deps = Deps { dep_mods = sortLe le_dep_mod dep_mods, - dep_pkgs = sortLe (<=) pkgs, - dep_orphs = sortLe le_mod (imp_orphs imports) } - -- sort to get into canonical order - - mod_guts = ModGuts { - mg_module = mod, - mg_boot = isHsBoot hsc_src, - mg_exports = exports, - mg_deps = deps, - mg_usages = usages, - mg_dir_imps = [m | (m,_,_) <- moduleEnvElts dir_imp_mods], - mg_rdr_env = rdr_env, - mg_fix_env = fix_env, - mg_deprecs = deprecs, - mg_types = type_env, - mg_insts = insts, - mg_rules = ds_rules, - mg_binds = ds_binds, - mg_foreign = ds_fords } - - ; return (warns, Just mod_guts) - }} - - where - dflags = hsc_dflags hsc_env - ghci_mode = ghcMode (hsc_dflags hsc_env) - auto_scc | opt_SccProfilingOn = TopLevel - | otherwise = NoSccs + ; used_names <- mkUsedNames tcg_env + ; deps <- mkDependencies tcg_env + + ; let mod_guts = ModGuts { + mg_module = mod, + mg_boot = isHsBoot hsc_src, + mg_exports = exports, + mg_deps = deps, + mg_used_names = used_names, + mg_dir_imps = imp_mods imports, + mg_rdr_env = rdr_env, + mg_fix_env = fix_env, + mg_warns = warns, + mg_anns = anns, + mg_types = type_env, + mg_insts = insts, + mg_fam_insts = fam_insts, + mg_inst_env = inst_env, + mg_fam_inst_env = fam_inst_env, + mg_rules = ds_rules, + mg_binds = ds_binds, + mg_foreign = ds_fords, + mg_hpc_info = ds_hpc_info, + mg_modBreaks = modBreaks, + mg_vect_info = noVectInfo + } + ; return (msgs, Just mod_guts) + }}} + +mkAutoScc :: DynFlags -> Module -> NameSet -> AutoScc +mkAutoScc dflags mod exports + | not opt_SccProfilingOn -- No profiling + = NoSccs + -- 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 CoreExpr -deSugarExpr hsc_env this_mod rdr_env type_env tc_expr - = do { showPass dflags "Desugar" - ; us <- mkSplitUniqSupply 'd' + -> IO (Messages, Maybe CoreExpr) +-- Prints its own errors; returns Nothing if error occurred - -- Do desugaring - ; (core_expr, ds_warns) <- initDs hsc_env this_mod rdr_env type_env $ - dsLExpr tc_expr +deSugarExpr hsc_env this_mod rdr_env type_env tc_expr = do + let dflags = hsc_dflags hsc_env + showPass dflags "Desugar" - -- Display any warnings - -- Note: if -Werror is used, we don't signal an error here. - ; doIfSet (not (isEmptyBag ds_warns)) - (printBagOfWarnings dflags ds_warns) + -- Do desugaring + (msgs, mb_core_expr) <- initDs hsc_env this_mod rdr_env type_env $ + dsLExpr tc_expr - -- Dump output - ; dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr core_expr) + case mb_core_expr of + Nothing -> return (msgs, Nothing) + Just expr -> do - ; return core_expr - } - where - dflags = hsc_dflags hsc_env + -- Dump output + dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr expr) + return (msgs, Just expr) -- addExportFlags -- Set the no-discard flag if either @@ -216,7 +206,9 @@ deSugarExpr hsc_env this_mod rdr_env type_env tc_expr -- it's just because the type checker is rather busy already and -- I didn't want to pass in yet another mapping. -addExportFlags ghci_mode exports keep_alive prs rules +addExportFlags :: HscTarget -> NameSet -> NameSet -> [(Id, t)] -> [CoreRule] + -> [(Id, t)] +addExportFlags target exports keep_alive prs rules = [(add_export bndr, rhs) | (bndr,rhs) <- prs] where add_export bndr @@ -245,12 +237,13 @@ addExportFlags ghci_mode exports keep_alive prs rules -- isExternalName separates the user-defined top-level names from those -- introduced by the type checker. is_exported :: Name -> Bool - is_exported | ghci_mode == Interactive = isExternalName + is_exported | target == HscInterpreted = isExternalName | otherwise = (`elemNameSet` exports) +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} @@ -263,37 +256,32 @@ ppr_ds_rules rules %************************************************************************ \begin{code} -dsRule :: Module -> IdSet -> LRuleDecl Id -> DsM (Maybe CoreRule) -dsRule mod in_scope (L loc (HsRule name act vars lhs tv_lhs rhs fv_rhs)) +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 bndrs lhs' of { - Nothing -> do { dsWarn msg; return Nothing } ; - Just (bndrs', fn_id, args) -> do - -- Substitute the dict bindings eagerly, -- and take the body apart into a (f args) form - { let local_rule = nameIsLocalOrFrom mod fn_name - -- NB we can't use isLocalId in the orphan test, - -- because isLocalId isn't true of class methods + ; 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, + -- because they don't show up in the bindings until just before code gen fn_name = idName fn_id - lhs_names = fn_name : nameSetToList (exprsFreeNames args) - -- No need to delete bndrs, because - -- exprsFreeNames finds only External names - orph = case filter (nameIsLocalOrFrom mod) lhs_names of - (n:ns) -> Just (nameOccName n) - [] -> Nothing rule = Rule { ru_name = name, ru_fn = fn_name, ru_act = act, - ru_bndrs = bndrs', ru_args = args, ru_rhs = rhs', + ru_bndrs = bndrs, ru_args = args, ru_rhs = rhs', ru_rough = roughTopNames args, - ru_local = local_rule, ru_orph = orph } + ru_local = local_rule } ; 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}