%
+% (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 UniqFM
+import PackageConfig
+import RdrName
import NameSet
import VarSet
-import Rules ( roughTopNames )
-import CoreLint ( showPass, endPass )
-import CoreFVs ( ruleRhsFreeVars, exprsFreeNames )
-import ErrUtils ( doIfSet, dumpIfSet_dyn )
-import ListSetOps ( insertList )
+import Rules
+import CoreLint
+import CoreFVs
+import ErrUtils
+import ListSetOps
import Outputable
-import SrcLoc ( Located(..) )
-import DATA_IOREF ( readIORef )
-import Maybes ( catMaybes )
+import SrcLoc
+import Maybes
import FastString
-import Util ( sortLe )
+import Util
+
+import Data.IORef
\end{code}
%************************************************************************
tcg_binds = binds,
tcg_fords = fords,
tcg_rules = rules,
- tcg_insts = insts })
+ tcg_insts = insts,
+ tcg_fam_insts = fam_insts })
= do { showPass dflags "Desugar"
-- Desugar the program
+ ; let export_set = availsToNameSet exports
+ ; let auto_scc = mkAutoScc mod export_set
+
; mb_res <- case ghcMode dflags of
JustTypecheck -> return (Just ([], [], NoStubs))
_ -> initDs hsc_env mod rdr_env type_env $ 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 ghci_mode 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#
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) }
+ deps = Deps { dep_mods = sortLe le_dep_mod dep_mods,
+ dep_pkgs = sortLe (<=) pkgs,
+ dep_orphs = sortLe le_mod (imp_orphs imports),
+ dep_finsts = sortLe le_mod (imp_finsts 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 }
+ 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_fam_insts = fam_insts,
+ mg_rules = ds_rules,
+ mg_binds = ds_binds,
+ mg_foreign = ds_fords }
; return (Just mod_guts)
}}}
where
dflags = hsc_dflags hsc_env
ghci_mode = ghcMode (hsc_dflags hsc_env)
- auto_scc | opt_SccProfilingOn = TopLevel
- | otherwise = NoSccs
+
+mkAutoScc :: Module -> NameSet -> AutoScc
+mkAutoScc mod exports
+ | not opt_SccProfilingOn -- No profiling
+ = NoSccs
+ | opt_AutoSccsOnAllToplevs -- Add auto-scc on all top-level things
+ = AddSccs mod (\id -> True)
+ | opt_AutoSccsOnExportedToplevs -- Only on exported things
+ = AddSccs mod (\id -> idName id `elemNameSet` exports)
+ | otherwise
+ = NoSccs
+
deSugarExpr :: HscEnv
-> Module -> GlobalRdrEnv -> TypeEnv
lhs_names = fn_name : nameSetToList (exprsFreeNames args)
-- No need to delete bndrs, because
-- exprsFreeNames finds only External names
+
+ -- A rule is an orphan only if none of the variables
+ -- mentioned on its left-hand side are locally defined
orph = case filter (nameIsLocalOrFrom mod) lhs_names of
(n:ns) -> Just (nameOccName n)
[] -> Nothing
projects / ghc-hetmet.git / blobdiff