%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1995
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
%
\section[Desugar]{@deSugar@: the main function}
\begin{code}
#include "HsVersions.h"
-module Desugar (
- deSugar,
+module Desugar ( deSugar, DsMatchContext, pprDsWarnings,
+ DsWarnFlavour -- removed when compiling with 1.4
+ ) where
- -- and to make the interface self-sufficient...
- SplitUniqSupply, Binds, Expr, Id, TypecheckedPat,
- CoreBinding, GlobalSwitch, SwitchResult,
- Bag, DsMatchContext, DsMatchKind
- ) where
+IMP_Ubiq(){-uitous-}
+import HsSyn ( HsBinds, HsExpr )
+import TcHsSyn ( SYN_IE(TypecheckedHsBinds), SYN_IE(TypecheckedHsExpr) )
+import CoreSyn
+import Name ( isExported )
+import DsMonad
+import DsBinds ( dsBinds, dsInstBinds )
+import DsUtils
-import AbsSyn -- the stuff being desugared
-import PlainCore -- the output of desugaring;
- -- importing this module also gets all the
- -- CoreSyn utility functions
-import DsMonad -- the monadery used in the desugarer
-
-import Bag ( unionBags, Bag )
-import CmdLineOpts ( switchIsOn, GlobalSwitch(..), SwitchResult )
+import Bag ( unionBags )
+import CmdLineOpts ( opt_DoCoreLinting, opt_AutoSccsOnAllToplevs,
+ opt_AutoSccsOnExportedToplevs, opt_SccGroup
+ )
+import CostCentre ( IsCafCC(..), mkAutoCC )
import CoreLift ( liftCoreBindings )
import CoreLint ( lintCoreBindings )
-import DsBinds ( dsBinds, dsInstBinds )
-import IdEnv
-import Pretty ( PprStyle(..) )
-import SplitUniq
-import Util
+import Id ( nullIdEnv, mkIdEnv, idType, SYN_IE(DictVar), GenId )
+import PprStyle ( PprStyle(..) )
+import UniqSupply ( splitUniqSupply )
\end{code}
-The only trick here is to get the @DesugarMonad@ stuff off to a good
+The only trick here is to get the @DsMonad@ stuff off to a good
start.
\begin{code}
-deSugar :: SplitUniqSupply -- name supply
- -> (GlobalSwitch->SwitchResult) -- switch looker upper
+deSugar :: UniqSupply -- name supply
-> FAST_STRING -- module name
- -> (TypecheckedBinds, -- input: class, instance, and value
- TypecheckedBinds, -- bindings; see "tcModule" (which produces
- TypecheckedBinds, -- them)
- [(Inst, TypecheckedExpr)])
+ -> (TypecheckedHsBinds, -- input: recsel, class, instance, and value
+ TypecheckedHsBinds, -- bindings; see "tcModule" (which produces
+ TypecheckedHsBinds, -- them)
+ TypecheckedHsBinds,
+ [(Id, TypecheckedHsExpr)])
-- ToDo: handling of const_inst thingies is certainly WRONG ***************************
- -> ([PlainCoreBinding], -- output
- Bag DsMatchContext) -- Shadowing complaints
+ -> ([CoreBinding], -- output
+ DsWarnings) -- Shadowing complaints
-deSugar us sw_chkr mod_name (clas_binds, inst_binds, val_binds, const_inst_pairs)
+deSugar us mod_name (recsel_binds, clas_binds, inst_binds, val_binds, const_inst_pairs)
= let
(us0, us0a) = splitUniqSupply us
(us1, us1a) = splitUniqSupply us0a
(us2, us2a) = splitUniqSupply us1a
- (us3, us4) = splitUniqSupply us2a
+ (us3, us3a) = splitUniqSupply us2a
+ (us4, us5) = splitUniqSupply us3a
+
+
+ module_and_group = (mod_name, grp_name)
+ grp_name = case opt_SccGroup of
+ Just xx -> _PK_ xx
+ Nothing -> mod_name -- default: module name
((core_const_prs, consts_pairs), shadows1)
- = initDs us0 nullIdEnv sw_chkr mod_name (dsInstBinds [] const_inst_pairs)
+ = initDs us0 nullIdEnv mod_name (dsInstBinds [] const_inst_pairs)
consts_env = mkIdEnv consts_pairs
(core_clas_binds, shadows2)
- = initDs us1 consts_env sw_chkr mod_name (dsBinds clas_binds)
+ = initDs us1 consts_env mod_name (dsBinds clas_binds)
core_clas_prs = pairsFromCoreBinds core_clas_binds
-
+
(core_inst_binds, shadows3)
- = initDs us2 consts_env sw_chkr mod_name (dsBinds inst_binds)
+ = initDs us2 consts_env mod_name (dsBinds inst_binds)
core_inst_prs = pairsFromCoreBinds core_inst_binds
-
+
(core_val_binds, shadows4)
- = initDs us3 consts_env sw_chkr mod_name (dsBinds val_binds)
- core_val_pairs = pairsFromCoreBinds core_val_binds
+ = initDs us3 consts_env mod_name (dsBinds val_binds)
+ core_val_pairs = map (addAutoScc module_and_group) (pairsFromCoreBinds core_val_binds)
+
+ (core_recsel_binds, shadows5)
+ = initDs us4 consts_env mod_name (dsBinds recsel_binds)
+ core_recsel_prs = pairsFromCoreBinds core_recsel_binds
final_binds
- = if (null core_clas_prs && null core_inst_prs && null core_const_prs) then
+ = if (null core_clas_prs && null core_inst_prs
+ && null core_recsel_prs {-???dont know???-} && null core_const_prs) then
-- we don't have to make the whole thing recursive
core_clas_binds ++ core_val_binds
else -- gotta make it recursive (sigh)
- [CoRec (core_clas_prs ++ core_inst_prs ++ core_const_prs ++ core_val_pairs)]
+ [Rec (core_clas_prs ++ core_inst_prs
+ ++ core_const_prs ++ core_val_pairs ++ core_recsel_prs)]
- lift_final_binds = {-if switchIsOn sw_chkr GlasgowExts
- then-} liftCoreBindings us4 final_binds
- -- else final_binds
+ lift_final_binds = liftCoreBindings us5 final_binds
- really_final_binds = if switchIsOn sw_chkr DoCoreLinting
+ really_final_binds = if opt_DoCoreLinting
then lintCoreBindings PprDebug "Desugarer" False lift_final_binds
else lift_final_binds
- shadows = shadows1 `unionBags` shadows2 `unionBags` shadows3 `unionBags` shadows4
+ shadows = shadows1 `unionBags` shadows2 `unionBags`
+ shadows3 `unionBags` shadows4 `unionBags` shadows5
in
(really_final_binds, shadows)
\end{code}
+
+
+%************************************************************************
+%* *
+\subsection[addAutoScc]{Adding automatic sccs}
+%* *
+%************************************************************************
+
+\begin{code}
+addAutoScc :: (FAST_STRING, FAST_STRING) -- Module and group
+ -> (Id, CoreExpr)
+ -> (Id,CoreExpr)
+
+addAutoScc (mod, grp) pair@(bndr, core_expr)
+ | worthSCC core_expr &&
+ (opt_AutoSccsOnAllToplevs ||
+ (isExported bndr && opt_AutoSccsOnExportedToplevs))
+ = (bndr, SCC (mkAutoCC bndr mod grp IsNotCafCC) core_expr)
+
+ | otherwise
+ = pair
+
+worthSCC (SCC _ _) = False
+worthSCC (Con _ _) = False
+worthSCC core_expr = True
+\end{code}
projects / ghc-hetmet.git / blobdiff