Add {-# OPTIONS_GHC -w #-} and some blurb to all compiler modules

[ghc-hetmet.git] / compiler / deSugar / DsMonad.lhs

diff --git a/compiler/deSugar/DsMonad.lhs b/compiler/deSugar/DsMonad.lhs
index 347f6b6..4af6f68 100644 (file)
--- a/compiler/deSugar/DsMonad.lhs
+++ b/compiler/deSugar/DsMonad.lhs
@@ -1,9 +1,18 @@
 %
+% (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_GHC -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/WorkingConventions#Warnings
+-- for details
+
 module DsMonad (
        DsM, mappM, mapAndUnzipM,
        initDs, initDsTc, returnDs, thenDs, listDs, fixDs, mapAndUnzipDs, 
@@ -16,8 +25,9 @@ module DsMonad (
        getModuleDs,
        newUnique, 
        UniqSupply, newUniqueSupply,
-       getDOptsDs,
+       getDOptsDs, getGhcModeDs, doptDs,
        dsLookupGlobal, dsLookupGlobalId, dsLookupTyCon, dsLookupDataCon,
+        dsLookupClass,
 
        DsMetaEnv, DsMetaVal(..), dsLookupMetaEnv, dsExtendMetaEnv,
 
@@ -26,36 +36,36 @@ module DsMonad (
 
        -- 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}
@@ -77,7 +87,7 @@ data EquationInfo
              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 })
@@ -160,7 +170,7 @@ initDs  :: HscEnv
 
 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
+        ; (ds_gbl_env, ds_lcl_env) <- mkDsEnvs 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)
@@ -188,21 +198,24 @@ initDsTc thing_inside
        ; msg_var  <- getErrsVar
        ; 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 }
+        ; ds_envs <- ioToIOEnv$ mkDsEnvs this_mod rdr_env type_env msg_var
+       ; setEnvs ds_envs thing_inside }
 
-mkDsEnvs :: Module -> GlobalRdrEnv -> TypeEnv
-        -> IORef Messages -> (DsGblEnv, DsLclEnv)
+mkDsEnvs :: Module -> GlobalRdrEnv -> TypeEnv -> IORef Messages -> IO (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 }
+  = 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 rdr_env,
+                                   ds_msgs = msg_var}
+               lcl_env = DsLclEnv { ds_meta = emptyNameEnv, 
+                                   ds_loc = noSrcSpan }
+
+       return (gbl_env, lcl_env)
+
 \end{code}
 
 %************************************************************************
@@ -255,6 +268,12 @@ the @SrcSpan@ being carried around.
 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) }
 
@@ -304,6 +323,11 @@ dsLookupDataCon :: Name -> DsM DataCon
 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}
@@ -314,5 +338,3 @@ dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a
 dsExtendMetaEnv menv thing_inside
   = updLclEnv (\env -> env { ds_meta = ds_meta env `plusNameEnv` menv }) thing_inside
 \end{code}
-
-