X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FdeSugar%2FDsMonad.lhs;h=83a5d212ae84eb720408de651dc585db50676ba0;hb=7bb3d1fc79521d591cd9f824893963141a7997b6;hp=52b7705660aa0f6305180482aba20dba902c63da;hpb=281fbc8eea81167cf1208b82c670a65b625b131d;p=ghc-hetmet.git

diff --git a/compiler/deSugar/DsMonad.lhs b/compiler/deSugar/DsMonad.lhs
index 52b7705..83a5d21 100644
--- a/compiler/deSugar/DsMonad.lhs
+++ b/compiler/deSugar/DsMonad.lhs
@@ -12,9 +12,9 @@ module DsMonad (
 	foldlM, foldrM, ifOptM,
 	Applicative(..),(<$>),
 
-	newTyVarsDs, newLocalName,
+	newLocalName,
 	duplicateLocalDs, newSysLocalDs, newSysLocalsDs, newUniqueId,
-	newFailLocalDs,
+	newFailLocalDs, newPredVarDs,
 	getSrcSpanDs, putSrcSpanDs,
 	getModuleDs,
 	newUnique, 
@@ -34,8 +34,6 @@ module DsMonad (
 	CanItFail(..), orFail
     ) where
 
-#include "HsVersions.h"
-
 import TcRnMonad
 import CoreSyn
 import HsSyn
@@ -59,6 +57,7 @@ import OccName
 import DynFlags
 import ErrUtils
 import MonadUtils
+import FastString
 
 import Data.IORef
 \end{code}
@@ -79,6 +78,9 @@ data EquationInfo
   = EqnInfo { eqn_pats :: [Pat Id],    	-- The patterns for an eqn
 	      eqn_rhs  :: MatchResult }	-- What to do after match
 
+instance Outputable EquationInfo where
+    ppr (EqnInfo pats _) = ppr pats
+
 type DsWrapper = CoreExpr -> CoreExpr
 idDsWrapper :: DsWrapper
 idDsWrapper e = e
@@ -154,7 +156,7 @@ data DsMetaVal
 initDs  :: HscEnv
 	-> Module -> GlobalRdrEnv -> TypeEnv
 	-> DsM a
-	-> IO (Maybe a)
+	-> IO (Messages, Maybe a)
 -- Print errors and warnings, if any arise
 
 initDs hsc_env mod rdr_env type_env thing_inside
@@ -168,7 +170,6 @@ initDs hsc_env mod rdr_env type_env thing_inside
 	-- Display any errors and warnings 
 	-- Note: if -Werror is used, we don't signal an error here.
 	; msgs <- readIORef msg_var
-        ; printErrorsAndWarnings dflags msgs 
 
 	; let final_res | errorsFound dflags msgs = Nothing
 		        | otherwise = case either_res of
@@ -178,7 +179,7 @@ initDs hsc_env mod rdr_env type_env thing_inside
 		-- a UserError exception.  Then it should have put an error
 		-- message in msg_var, so we just discard the exception
 
-	; return final_res }
+	; return (msgs, final_res) }
 
 initDsTc :: DsM a -> TcM a
 initDsTc thing_inside
@@ -195,7 +196,7 @@ mkDsEnvs :: DynFlags -> Module -> GlobalRdrEnv -> TypeEnv -> IORef Messages -> I
 mkDsEnvs dflags mod rdr_env type_env msg_var
   = do -- TODO: unnecessarily monadic
        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)
+               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,
@@ -204,7 +205,6 @@ mkDsEnvs dflags mod rdr_env type_env msg_var
 			            ds_loc = noSrcSpan }
 
        return (gbl_env, lcl_env)
-
 \end{code}
 
 %************************************************************************
@@ -221,34 +221,29 @@ it easier to read debugging output.
 \begin{code}
 -- Make a new Id with the same print name, but different type, and new unique
 newUniqueId :: Name -> Type -> DsM Id
-newUniqueId id ty = do
-    uniq <- newUnique
-    return (mkSysLocal (occNameFS (nameOccName id)) uniq ty)
+newUniqueId id = mkSysLocalM (occNameFS (nameOccName id))
 
 duplicateLocalDs :: Id -> DsM Id
-duplicateLocalDs old_local = do
-    uniq <- newUnique
-    return (setIdUnique old_local uniq)
-
+duplicateLocalDs old_local 
+  = do	{ uniq <- newUnique
+	; return (setIdUnique old_local uniq) }
+
+newPredVarDs :: PredType -> DsM Var
+newPredVarDs pred
+ | isEqPred pred
+ = do { uniq <- newUnique; 
+      ; let name = mkSystemName uniq (mkOccNameFS tcName (fsLit "co"))
+	    kind = mkPredTy pred
+      ; return (mkCoVar name kind) }
+ | otherwise
+ = newSysLocalDs (mkPredTy pred)
+ 
 newSysLocalDs, newFailLocalDs :: Type -> DsM Id
-newSysLocalDs ty = do
-    uniq <- newUnique
-    return (mkSysLocal FSLIT("ds") uniq ty)
+newSysLocalDs  = mkSysLocalM (fsLit "ds")
+newFailLocalDs = mkSysLocalM (fsLit "fail")
 
 newSysLocalsDs :: [Type] -> DsM [Id]
 newSysLocalsDs tys = mapM newSysLocalDs tys
-
-newFailLocalDs ty = do
-    uniq <- newUnique
-    return (mkSysLocal FSLIT("fail") uniq ty)
-	-- The UserLocal bit just helps make the code a little clearer
-\end{code}
-
-\begin{code}
-newTyVarsDs :: [TyVar] -> DsM [TyVar]
-newTyVarsDs tyvar_tmpls = do
-    uniqs <- newUniqueSupply
-    return (zipWith setTyVarUnique tyvar_tmpls (uniqsFromSupply uniqs))
 \end{code}
 
 We can also reach out and either set/grab location information from
@@ -277,9 +272,8 @@ warnDs :: SDoc -> DsM ()
 warnDs warn = do { env <- getGblEnv 
 		 ; loc <- getSrcSpanDs
 		 ; let msg = mkWarnMsg loc (ds_unqual env) 
-				      (ptext SLIT("Warning:") <+> warn)
+				      (ptext (sLit "Warning:") <+> warn)
 		 ; updMutVar (ds_msgs env) (\ (w,e) -> (w `snocBag` msg, e)) }
-	    where
 
 failWithDs :: SDoc -> DsM a
 failWithDs err 
@@ -288,10 +282,12 @@ failWithDs err
 	; let msg = mkErrMsg loc (ds_unqual env) err
 	; updMutVar (ds_msgs env) (\ (w,e) -> (w, e `snocBag` msg))
 	; failM }
-	where
 \end{code}
 
 \begin{code}
+instance MonadThings (IOEnv (Env DsGblEnv DsLclEnv)) where
+    lookupThing = dsLookupGlobal
+
 dsLookupGlobal :: Name -> DsM TyThing
 -- Very like TcEnv.tcLookupGlobal
 dsLookupGlobal name