This goes with the patch for #1839, #1463

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

diff --git a/compiler/deSugar/DsMonad.lhs b/compiler/deSugar/DsMonad.lhs
index 9251a81..279416d 100644 (file)
--- a/compiler/deSugar/DsMonad.lhs
+++ b/compiler/deSugar/DsMonad.lhs
@@ -6,10 +6,17 @@
 @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, 
-       foldlDs, foldrDs,
+       foldlDs, foldrDs, ifOptDs,
 
        newTyVarsDs, newLocalName,
        duplicateLocalDs, newSysLocalDs, newSysLocalsDs, newUniqueId,
@@ -20,10 +27,10 @@ module DsMonad (
        UniqSupply, newUniqueSupply,
        getDOptsDs, getGhcModeDs, doptDs,
        dsLookupGlobal, dsLookupGlobalId, dsLookupTyCon, dsLookupDataCon,
+        dsLookupClass,
 
        DsMetaEnv, DsMetaVal(..), dsLookupMetaEnv, dsExtendMetaEnv,
 
-        bindLocalsDs, getLocalBindsDs, getBkptSitesDs, getModNameRefDs, withModNameRefDs,
        -- Warnings
        DsWarning, warnDs, failWithDs,
 
@@ -44,6 +51,7 @@ import HscTypes
 import Bag
 import DataCon
 import TyCon
+import Class
 import Id
 import Module
 import Var
@@ -56,9 +64,6 @@ import NameEnv
 import OccName
 import DynFlags
 import ErrUtils
-import Bag
-import Breakpoints
-import OccName
 
 import Data.IORef
 
@@ -125,7 +130,7 @@ listDs   = sequenceM
 foldlDs  = foldlM
 foldrDs  = foldrM
 mapAndUnzipDs = mapAndUnzipM
-
+ifOptDs   = ifOptM
 
 type DsWarning = (SrcSpan, SDoc)
        -- Not quite the same as a WarnMsg, we have an SDoc here 
@@ -136,17 +141,13 @@ data DsGblEnv = DsGblEnv {
        ds_mod     :: Module,                   -- For SCC profiling
        ds_unqual  :: PrintUnqualified,
        ds_msgs    :: IORef Messages,           -- Warning messages
-       ds_if_env  :: (IfGblEnv, IfLclEnv),     -- Used for looking up global, 
+       ds_if_env  :: (IfGblEnv, IfLclEnv)      -- Used for looking up global, 
                                                -- possibly-imported things
-        ds_bkptSites :: IORef SiteMap  -- Inserted Breakpoints sites
     }
 
 data DsLclEnv = DsLclEnv {
        ds_meta    :: DsMetaEnv,        -- Template Haskell bindings
-       ds_loc     :: SrcSpan,          -- to put in pattern-matching error msgs
-        ds_locals  :: OccEnv Id,        -- For locals in breakpoints
-        ds_mod_name_ref :: Maybe Id     -- The Id used to store the Module name 
-                                        --  used by the breakpoint desugaring 
+       ds_loc     :: SrcSpan           -- to put in pattern-matching error msgs
      }
 
 -- Inside [| |] brackets, the desugarer looks 
@@ -169,14 +170,14 @@ initDs  :: HscEnv
 
 initDs hsc_env mod rdr_env type_env thing_inside
   = do         { msg_var <- newIORef (emptyBag, emptyBag)
-        ; (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 
 
@@ -195,26 +196,24 @@ initDsTc thing_inside
   = 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
-        ; ds_envs <- ioToIOEnv$ mkDsEnvs this_mod rdr_env type_env msg_var
+        ; ds_envs <- ioToIOEnv$ mkDsEnvs dflags this_mod rdr_env type_env msg_var
        ; setEnvs ds_envs thing_inside }
 
-mkDsEnvs :: Module -> GlobalRdrEnv -> TypeEnv -> IORef Messages -> IO (DsGblEnv, DsLclEnv)
-mkDsEnvs mod rdr_env type_env msg_var
+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 rdr_env,
-                                   ds_msgs = msg_var,
-                                    ds_bkptSites = sites_var}
+                                   ds_unqual = mkPrintUnqualified dflags rdr_env,
+                                   ds_msgs = msg_var}
                lcl_env = DsLclEnv { ds_meta = emptyNameEnv, 
-                                   ds_loc = noSrcSpan,
-                                    ds_locals = emptyOccEnv,
-                                    ds_mod_name_ref = Nothing }
+                                   ds_loc = noSrcSpan }
 
        return (gbl_env, lcl_env)
 
@@ -325,6 +324,11 @@ 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}
@@ -335,26 +339,3 @@ dsExtendMetaEnv :: DsMetaEnv -> DsM a -> DsM a
 dsExtendMetaEnv menv thing_inside
   = updLclEnv (\env -> env { ds_meta = ds_meta env `plusNameEnv` menv }) thing_inside
 \end{code}
-
-\begin{code}
-getLocalBindsDs :: DsM [Id]
-getLocalBindsDs = do { env <- getLclEnv; return (occEnvElts$ ds_locals env) }
-
-getModNameRefDs :: DsM (Maybe Id)
-getModNameRefDs = do { env <- getLclEnv; return (ds_mod_name_ref env) }
-
-withModNameRefDs :: Id -> DsM a -> DsM a
-withModNameRefDs id thing_inside =
-    updLclEnv (\env -> env {ds_mod_name_ref = Just id}) thing_inside
-
-bindLocalsDs :: [Id] -> DsM a -> DsM a
-bindLocalsDs new_ids enclosed_scope = 
-    updLclEnv (\env-> env {ds_locals = ds_locals env `extendOccEnvList` occnamed_ids})
-             enclosed_scope
-  where occnamed_ids = [ (nameOccName (idName id),id) | id <- new_ids ] 
-
-getBkptSitesDs :: DsM (IORef SiteMap)
-getBkptSitesDs = do { env <- getGblEnv; return (ds_bkptSites env) }
-
-\end{code}
-