X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDesugar.lhs;h=9c4f03c0a63fb407239a8962c63bb2f7a4268a91;hb=5e34dfe261bf18325fc035ed92f716f3a6249142;hp=70bec841f865504785ad35c285eab539f4e927f1;hpb=243dedb8741d13162fe944ebf2adace921e0108d;p=ghc-hetmet.git diff --git a/ghc/compiler/deSugar/Desugar.lhs b/ghc/compiler/deSugar/Desugar.lhs index 70bec84..9c4f03c 100644 --- a/ghc/compiler/deSugar/Desugar.lhs +++ b/ghc/compiler/deSugar/Desugar.lhs @@ -4,18 +4,22 @@ \section[Desugar]{@deSugar@: the main function} \begin{code} -module Desugar ( deSugar ) where +module Desugar ( deSugar, deSugarExpr ) where #include "HsVersions.h" -import CmdLineOpts ( DynFlags, DynFlag(..), dopt, opt_SccProfilingOn ) +import CmdLineOpts ( DynFlag(..), dopt, opt_SccProfilingOn ) +import HscTypes ( ModGuts(..), ModGuts, HscEnv(..), ExternalPackageState(..), + PersistentCompilerState(..), Dependencies(..), TypeEnv, GlobalRdrEnv, + lookupType, unQualInScope ) import HsSyn ( MonoBinds, RuleDecl(..), RuleBndr(..), HsExpr(..), HsBinds(..), MonoBinds(..) ) -import TcHsSyn ( TypecheckedRuleDecl ) -import TcModule ( TcResults(..) ) +import TcHsSyn ( TypecheckedRuleDecl, TypecheckedHsExpr ) +import TcRnTypes ( TcGblEnv(..), ImportAvails(..) ) +import MkIface ( mkUsageInfo ) import Id ( Id ) import CoreSyn -import PprCore ( pprIdCoreRule ) +import PprCore ( pprIdRules, pprCoreExpr ) import Subst ( substExpr, mkSubst, mkInScopeSet ) import DsMonad import DsExpr ( dsExpr ) @@ -23,15 +27,21 @@ import DsBinds ( dsMonoBinds, AutoScc(..) ) import DsForeign ( dsForeigns ) import DsExpr () -- Forces DsExpr to be compiled; DsBinds only -- depends on DsExpr.hi-boot. -import Module ( Module ) +import Module ( Module, moduleEnvElts ) +import Id ( Id ) +import NameEnv ( lookupNameEnv ) import VarEnv import VarSet -import Bag ( isEmptyBag ) -import CoreLint ( beginPass, endPass ) -import ErrUtils ( doIfSet, pprBagOfWarnings ) +import Bag ( isEmptyBag, mapBag ) +import CoreLint ( showPass, endPass ) +import ErrUtils ( doIfSet, dumpIfSet_dyn, pprBagOfWarnings, addShortWarnLocLine ) import Outputable -import UniqSupply ( UniqSupply ) -import HscTypes ( HomeSymbolTable ) +import qualified Pretty +import UniqSupply ( mkSplitUniqSupply ) +import Maybes ( orElse ) +import SrcLoc ( SrcLoc ) +import FastString +import DATA_IOREF ( readIORef ) \end{code} %************************************************************************ @@ -40,46 +50,130 @@ import HscTypes ( HomeSymbolTable ) %* * %************************************************************************ -The only trick here is to get the @DsMonad@ stuff off to a good -start. - \begin{code} -deSugar :: DynFlags - -> Module - -> UniqSupply - -> HomeSymbolTable - -> TcResults - -> IO ([CoreBind], [(Id,CoreRule)], SDoc, SDoc, [CoreBndr]) - -deSugar dflags mod_name us hst - (TcResults {tc_env = global_val_env, - tc_pcs = pcs, - tc_binds = all_binds, - tc_rules = rules, - tc_fords = fo_decls}) - = do - beginPass dflags "Desugar" +deSugar :: HscEnv -> PersistentCompilerState + -> TcGblEnv -> IO ModGuts + +deSugar hsc_env pcs + (TcGblEnv { tcg_mod = mod, + tcg_type_env = type_env, + tcg_usages = usage_var, + tcg_imports = imports, + tcg_exports = exports, + tcg_rdr_env = rdr_env, + tcg_fix_env = fix_env, + tcg_deprecs = deprecs, + tcg_insts = insts, + tcg_binds = binds, + tcg_fords = fords, + tcg_rules = rules }) + = do { showPass dflags "Desugar" + ; us <- mkSplitUniqSupply 'd' + ; usages <- readIORef usage_var + -- Do desugaring - let (result, ds_warns) = - initDs dflags us (hst,pcs,global_val_env) mod_name - (dsProgram mod_name all_binds rules fo_decls) - (ds_binds, ds_rules, _, _, _) = result + ; let ((ds_binds, ds_rules, ds_fords), ds_warns) + = initDs dflags us lookup mod + (dsProgram binds rules fords) + + warn_doc = pprBagOfWarnings (mapBag mk_warn ds_warns) + + -- Display any warnings + ; doIfSet (not (isEmptyBag ds_warns)) + (printErrs warn_doc) - -- Display any warnings - doIfSet (not (isEmptyBag ds_warns)) - (printErrs (pprBagOfWarnings ds_warns)) + -- Lint result if necessary + ; endPass dflags "Desugar" Opt_D_dump_ds ds_binds + + -- Dump output + ; doIfSet (dopt Opt_D_dump_ds dflags) + (printDump (ppr_ds_rules ds_rules)) + + ; let + deps = Deps { dep_mods = moduleEnvElts (imp_dep_mods imports), + dep_pkgs = imp_dep_pkgs imports, + dep_orphs = imp_orphs imports } + mod_guts = ModGuts { + mg_module = mod, + mg_exports = exports, + mg_deps = deps, + mg_usages = mkUsageInfo hsc_env eps imports usages, + mg_dir_imps = [m | (m,_) <- moduleEnvElts (imp_mods imports)], + 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 mod_guts + } + + where + dflags = hsc_dflags hsc_env + print_unqual = unQualInScope rdr_env - -- Lint result if necessary - let do_dump_ds = dopt Opt_D_dump_ds dflags - endPass dflags "Desugar" do_dump_ds ds_binds + -- Desugarer warnings are SDocs; here we + -- add the info about whether or not to print unqualified + mk_warn :: (SrcLoc,SDoc) -> (SrcLoc, Pretty.Doc) + mk_warn (loc, sdoc) = addShortWarnLocLine loc print_unqual sdoc - doIfSet do_dump_ds (printDump (ppr_ds_rules ds_rules)) + -- The lookup function passed to initDs is used for well-known Ids, + -- such as fold, build, cons etc, so the chances are + -- it'll be found in the package symbol table. That's + -- why we don't merge all these tables + eps = pcs_EPS pcs + pte = eps_PTE eps + hpt = hsc_HPT hsc_env + lookup n = case lookupType hpt pte n of { + Just v -> v ; + other -> + case lookupNameEnv type_env n of + Just v -> v ; + other -> pprPanic "Desugar: lookup:" (ppr n) + } - return result +deSugarExpr :: HscEnv + -> PersistentCompilerState + -> Module -> GlobalRdrEnv -> TypeEnv + -> TypecheckedHsExpr + -> IO CoreExpr +deSugarExpr hsc_env pcs this_mod rdr_env type_env tc_expr + = do { showPass dflags "Desugar" + ; us <- mkSplitUniqSupply 'd' -dsProgram mod_name all_binds rules fo_decls + -- Do desugaring + ; let (core_expr, ds_warns) = initDs dflags us lookup this_mod (dsExpr tc_expr) + warn_doc = pprBagOfWarnings (mapBag mk_warn ds_warns) + + -- Display any warnings + ; doIfSet (not (isEmptyBag ds_warns)) + (printErrs warn_doc) + + -- Dump output + ; dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr core_expr) + + ; return core_expr + } + where + dflags = hsc_dflags hsc_env + hpt = hsc_HPT hsc_env + pte = eps_PTE (pcs_EPS pcs) + lookup n = lookupNameEnv type_env n `orElse` -- Look in the type env of the + -- current module first + lookupType hpt pte n `orElse` -- Then other modules + pprPanic "Desugar: lookup:" (ppr n) + + mk_warn :: (SrcLoc,SDoc) -> (SrcLoc, Pretty.Doc) + mk_warn (loc,sdoc) = addShortWarnLocLine loc print_unqual sdoc + + print_unqual = unQualInScope rdr_env + +dsProgram all_binds rules fo_decls = dsMonoBinds auto_scc all_binds [] `thenDs` \ core_prs -> - dsForeigns mod_name fo_decls `thenDs` \ (fe_binders, foreign_binds, h_code, c_code) -> + dsForeigns fo_decls `thenDs` \ (ds_fords, foreign_binds) -> let ds_binds = [Rec (foreign_binds ++ core_prs)] -- Notice that we put the whole lot in a big Rec, even the foreign binds @@ -90,8 +184,8 @@ dsProgram mod_name all_binds rules fo_decls local_binders = mkVarSet (bindersOfBinds ds_binds) in - mapDs (dsRule local_binders) rules `thenDs` \ rules' -> - returnDs (ds_binds, rules', h_code, c_code, fe_binders) + mapDs (dsRule local_binders) rules `thenDs` \ ds_rules -> + returnDs (ds_binds, ds_rules, ds_fords) where auto_scc | opt_SccProfilingOn = TopLevel | otherwise = NoSccs @@ -99,10 +193,11 @@ dsProgram mod_name all_binds rules fo_decls ppr_ds_rules [] = empty ppr_ds_rules rules = text "" $$ text "-------------- DESUGARED RULES -----------------" $$ - vcat (map pprIdCoreRule rules) + pprIdRules rules \end{code} + %************************************************************************ %* * %* Desugaring transformation rules @@ -111,13 +206,16 @@ ppr_ds_rules rules \begin{code} dsRule :: IdSet -> TypecheckedRuleDecl -> DsM (Id, CoreRule) -dsRule in_scope (HsRule name sig_tvs vars lhs rhs loc) +dsRule in_scope (IfaceRuleOut fun rule) -- Built-in rules come this way + = returnDs (fun, rule) + +dsRule in_scope (HsRule name act vars lhs rhs loc) = putSrcLocDs loc $ ds_lhs all_vars lhs `thenDs` \ (fn, args) -> dsExpr rhs `thenDs` \ core_rhs -> - returnDs (fn, Rule name tpl_vars args core_rhs) + returnDs (fn, Rule name act tpl_vars args core_rhs) where - tpl_vars = sig_tvs ++ [var | RuleBndr var <- vars] + tpl_vars = [var | RuleBndr var <- vars] all_vars = mkInScopeSet (in_scope `unionVarSet` mkVarSet tpl_vars) ds_lhs all_vars lhs