%
+% (c) The University of Glasgow 2006
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-\section[DsMonad]{@DsMonad@: monadery used in desugaring}
+
+@DsMonad@: monadery used in desugaring
\begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
module DsMonad (
DsM, mappM, mapAndUnzipM,
initDs, initDsTc, returnDs, thenDs, listDs, fixDs, mapAndUnzipDs,
getModuleDs,
newUnique,
UniqSupply, newUniqueSupply,
- getDOptsDs,
+ getDOptsDs, getGhcModeDs, doptDs,
dsLookupGlobal, dsLookupGlobalId, dsLookupTyCon, dsLookupDataCon,
+ dsLookupClass,
DsMetaEnv, DsMetaVal(..), dsLookupMetaEnv, dsExtendMetaEnv,
-- Data types
DsMatchContext(..),
- EquationInfo(..), MatchResult(..), DsWrapper, idWrapper,
+ EquationInfo(..), MatchResult(..), DsWrapper, idDsWrapper,
CanItFail(..), orFail
) where
#include "HsVersions.h"
import TcRnMonad
-import CoreSyn ( CoreExpr )
-import HsSyn ( HsExpr, HsMatchContext, Pat )
-import TcIface ( tcIfaceGlobal )
-import RdrName ( GlobalRdrEnv )
-import HscTypes ( TyThing(..), TypeEnv, HscEnv(..),
- tyThingId, tyThingTyCon, tyThingDataCon, mkPrintUnqualified )
-import Bag ( emptyBag, snocBag )
-import DataCon ( DataCon )
-import TyCon ( TyCon )
-import Id ( mkSysLocal, setIdUnique, Id )
-import Module ( Module )
-import Var ( TyVar, setTyVarUnique )
+import CoreSyn
+import HsSyn
+import TcIface
+import RdrName
+import HscTypes
+import Bag
+import DataCon
+import TyCon
+import Class
+import Id
+import Module
+import Var
import Outputable
-import SrcLoc ( noSrcSpan, SrcSpan )
-import Type ( Type )
-import UniqSupply ( UniqSupply, uniqsFromSupply )
-import Name ( Name, nameOccName )
+import SrcLoc
+import Type
+import UniqSupply
+import Name
import NameEnv
-import OccName ( occNameFS )
-import DynFlags ( DynFlags )
-import ErrUtils ( Messages, mkWarnMsg, mkErrMsg,
- printErrorsAndWarnings, errorsFound )
-import DATA_IOREF ( newIORef, readIORef )
+import OccName
+import DynFlags
+import ErrUtils
+
+import Data.IORef
infixr 9 `thenDs`
\end{code}
deriving ()
data EquationInfo
- = EqnInfo { eqn_wrap :: DsWrapper, -- Bindings
- eqn_pats :: [Pat Id], -- The patterns for an eqn
+ = EqnInfo { eqn_pats :: [Pat Id], -- The patterns for an eqn
eqn_rhs :: MatchResult } -- What to do after match
type DsWrapper = CoreExpr -> CoreExpr
-idWrapper e = e
+idDsWrapper e = e
-- The semantics of (match vs (EqnInfo wrap pats rhs)) is the MatchResult
-- \fail. wrap (case vs of { pats -> rhs fail })
initDs hsc_env mod rdr_env type_env thing_inside
= do { msg_var <- newIORef (emptyBag, emptyBag)
- ; let (ds_gbl_env, ds_lcl_env) = mkDsEnvs mod rdr_env type_env msg_var
+ ; let dflags = hsc_dflags hsc_env
+ ; (ds_gbl_env, ds_lcl_env) <- mkDsEnvs dflags mod rdr_env type_env msg_var
; either_res <- initTcRnIf 'd' hsc_env ds_gbl_env ds_lcl_env $
tryM thing_inside -- Catch exceptions (= errors during desugaring)
-- Display any errors and warnings
-- Note: if -Werror is used, we don't signal an error here.
- ; let dflags = hsc_dflags hsc_env
; msgs <- readIORef msg_var
; printErrorsAndWarnings dflags msgs
= do { this_mod <- getModule
; tcg_env <- getGblEnv
; msg_var <- getErrsVar
+ ; dflags <- getDOpts
; let type_env = tcg_type_env tcg_env
rdr_env = tcg_rdr_env tcg_env
- ; setEnvs (mkDsEnvs this_mod rdr_env type_env msg_var) thing_inside }
-
-mkDsEnvs :: Module -> GlobalRdrEnv -> TypeEnv
- -> IORef Messages -> (DsGblEnv, DsLclEnv)
-mkDsEnvs mod rdr_env type_env msg_var
- = (gbl_env, lcl_env)
- where
- if_genv = IfGblEnv { if_rec_types = Just (mod, return type_env) }
- if_lenv = mkIfLclEnv mod (ptext SLIT("GHC error in desugarer lookup in") <+> ppr mod)
- gbl_env = DsGblEnv { ds_mod = mod,
- ds_if_env = (if_genv, if_lenv),
- ds_unqual = mkPrintUnqualified rdr_env,
- ds_msgs = msg_var }
- lcl_env = DsLclEnv { ds_meta = emptyNameEnv,
- ds_loc = noSrcSpan }
+ ; ds_envs <- ioToIOEnv$ mkDsEnvs dflags this_mod rdr_env type_env msg_var
+ ; setEnvs ds_envs thing_inside }
+
+mkDsEnvs :: DynFlags -> Module -> GlobalRdrEnv -> TypeEnv -> IORef Messages -> IO (DsGblEnv, DsLclEnv)
+mkDsEnvs dflags mod rdr_env type_env msg_var
+ = do
+ sites_var <- newIORef []
+ let if_genv = IfGblEnv { if_rec_types = Just (mod, return type_env) }
+ if_lenv = mkIfLclEnv mod (ptext SLIT("GHC error in desugarer lookup in") <+> ppr mod)
+ gbl_env = DsGblEnv { ds_mod = mod,
+ ds_if_env = (if_genv, if_lenv),
+ ds_unqual = mkPrintUnqualified dflags rdr_env,
+ ds_msgs = msg_var}
+ lcl_env = DsLclEnv { ds_meta = emptyNameEnv,
+ ds_loc = noSrcSpan }
+
+ return (gbl_env, lcl_env)
+
\end{code}
%************************************************************************
getDOptsDs :: DsM DynFlags
getDOptsDs = getDOpts
+doptDs :: DynFlag -> TcRnIf gbl lcl Bool
+doptDs = doptM
+
+getGhcModeDs :: DsM GhcMode
+getGhcModeDs = getDOptsDs >>= return . ghcMode
+
getModuleDs :: DsM Module
getModuleDs = do { env <- getGblEnv; return (ds_mod env) }
dsLookupDataCon name
= dsLookupGlobal name `thenDs` \ thing ->
returnDs (tyThingDataCon thing)
+
+dsLookupClass :: Name -> DsM Class
+dsLookupClass name
+ = dsLookupGlobal name `thenDs` \ thing ->
+ returnDs (tyThingClass thing)
\end{code}
\begin{code}
dsExtendMetaEnv menv thing_inside
= updLclEnv (\env -> env { ds_meta = ds_meta env `plusNameEnv` menv }) thing_inside
\end{code}
-
-