X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDsMonad.lhs;h=53c9f7db9b29881129d72d1d233daee2c75cd041;hb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;hp=3428be64465324c973a2cb5a722228066016cb10;hpb=44f98be5b3bc7aaf2c5961667b16ee8eca3e67c1;p=ghc-hetmet.git

diff --git a/ghc/compiler/deSugar/DsMonad.lhs b/ghc/compiler/deSugar/DsMonad.lhs
index 3428be6..53c9f7d 100644
--- a/ghc/compiler/deSugar/DsMonad.lhs
+++ b/ghc/compiler/deSugar/DsMonad.lhs
@@ -1,55 +1,48 @@
 %
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
 \section[DsMonad]{@DsMonad@: monadery used in desugaring}
 
 \begin{code}
-#include "HsVersions.h"
-
 module DsMonad (
-	SYN_IE(DsM),
+	DsM,
 	initDs, returnDs, thenDs, andDs, mapDs, listDs,
-	mapAndUnzipDs, zipWithDs,
+	mapAndUnzipDs, zipWithDs, foldlDs,
 	uniqSMtoDsM,
 	newTyVarsDs, cloneTyVarsDs,
 	duplicateLocalDs, newSysLocalDs, newSysLocalsDs,
 	newFailLocalDs,
 	getSrcLocDs, putSrcLocDs,
 	getModuleAndGroupDs,
-	extendEnvDs, lookupEnvDs, 
-	SYN_IE(DsIdEnv),
-
-	dsShadowWarn, dsIncompleteWarn,
-	SYN_IE(DsWarnings),
-	DsMatchContext(..), DsMatchKind(..), pprDsWarnings,
-        DsWarnFlavour -- Nuke with 1.4
+	getUniqueDs,
+	dsLookupGlobalValue,
 
+	GlobalValueEnv,
+	dsWarn, 
+	DsWarnings,
+	DsMatchContext(..), DsMatchKind(..), pprDsWarnings
     ) where
 
-IMP_Ubiq()
+#include "HsVersions.h"
 
 import Bag		( emptyBag, snocBag, bagToList, Bag )
-import BasicTypes       ( SYN_IE(Module) )
-import CmdLineOpts	( opt_PprUserLength )
-import CoreSyn		( SYN_IE(CoreExpr) )
-import CoreUtils	( substCoreExpr )
+import BasicTypes       ( Module )
+import ErrUtils 	( WarnMsg )
 import HsSyn		( OutPat )
-import Id		( mkSysLocal, mkIdWithNewUniq,
-			  lookupIdEnv, growIdEnvList, GenId, SYN_IE(IdEnv),
-			  SYN_IE(Id)
-			)
-import PprType		( GenType, GenTyVar )
-import Outputable	( pprQuote, Outputable(..), PprStyle(..) )
-import Pretty
+import Id		( mkUserLocal, mkSysLocal, setIdUnique, Id )
+import Name		( Name, varOcc, maybeWiredInIdName )
+import Var		( TyVar, setTyVarUnique )
+import VarEnv
+import Outputable
 import SrcLoc		( noSrcLoc, SrcLoc )
-import TcHsSyn		( SYN_IE(TypecheckedPat) )
-import Type             ( SYN_IE(Type) )
-import TyVar		( nullTyVarEnv, cloneTyVar, GenTyVar{-instance Eq-}, SYN_IE(TyVar) )
-import Unique		( Unique{-instances-} )
-import UniqSupply	( splitUniqSupply, getUnique, getUniques,
-			  mapUs, thenUs, returnUs, SYN_IE(UniqSM),
-			  UniqSupply )
-import Util		( assoc, mapAccumL, zipWithEqual, panic )
+import TcHsSyn		( TypecheckedPat )
+import TcEnv		( GlobalValueEnv )
+import Type             ( Type )
+import UniqSupply	( initUs, splitUniqSupply, uniqFromSupply, uniqsFromSupply,
+			  UniqSM, UniqSupply )
+import Unique		( Unique )
+import UniqFM		( lookupWithDefaultUFM )
+import Util		( zipWithEqual, panic )
 
 infixr 9 `thenDs`
 \end{code}
@@ -60,14 +53,13 @@ presumably include source-file location information:
 \begin{code}
 type DsM result =
 	UniqSupply
+        -> GlobalValueEnv
 	-> SrcLoc		 -- to put in pattern-matching error msgs
 	-> (Module, Group)       -- module + group name : for SCC profiling
-	-> DsIdEnv
 	-> DsWarnings
 	-> (result, DsWarnings)
 
-type DsWarnings = Bag (DsWarnFlavour, DsMatchContext)
-					-- The desugarer reports matches which are
+type DsWarnings = Bag WarnMsg           -- The desugarer reports matches which are
 					-- completely shadowed or incomplete patterns
 
 type Group = FAST_STRING
@@ -79,30 +71,30 @@ type Group = FAST_STRING
 -- initDs returns the UniqSupply out the end (not just the result)
 
 initDs  :: UniqSupply
-	-> DsIdEnv
+	-> GlobalValueEnv
 	-> (Module, Group)      -- module name: for profiling; (group name: from switches)
 	-> DsM a
 	-> (a, DsWarnings)
 
-initDs init_us env module_and_group action
-  = action init_us noSrcLoc module_and_group env emptyBag
+initDs init_us genv module_and_group action
+  = action init_us genv noSrcLoc module_and_group emptyBag
 
 thenDs :: DsM a -> (a -> DsM b) -> DsM b
 andDs  :: (a -> a -> a) -> DsM a -> DsM a -> DsM a
 
-thenDs m1 m2 us loc mod_and_grp env warns
+thenDs m1 m2 us genv loc mod_and_grp warns
   = case splitUniqSupply us		    of { (s1, s2) ->
-    case (m1 s1 loc mod_and_grp env warns)  of { (result, warns1) ->
-    m2 result s2 loc mod_and_grp env warns1}}
+    case (m1 s1 genv loc mod_and_grp warns)  of { (result, warns1) ->
+    m2 result s2 genv loc mod_and_grp warns1}}
 
-andDs combiner m1 m2 us loc mod_and_grp env warns
+andDs combiner m1 m2 us genv loc mod_and_grp warns
   = case splitUniqSupply us		    of { (s1, s2) ->
-    case (m1 s1 loc mod_and_grp env warns)  of { (result1, warns1) ->
-    case (m2 s2 loc mod_and_grp env warns1) of { (result2, warns2) ->
+    case (m1 s1 genv loc mod_and_grp warns)  of { (result1, warns1) ->
+    case (m2 s2 genv loc mod_and_grp warns1) of { (result2, warns2) ->
     (combiner result1 result2, warns2) }}}
 
 returnDs :: a -> DsM a
-returnDs result us loc mod_and_grp env warns = (result, warns)
+returnDs result us genv loc mod_and_grp warns = (result, warns)
 
 listDs :: [DsM a] -> DsM [a]
 listDs []     = returnDs []
@@ -119,6 +111,12 @@ mapDs f (x:xs)
     mapDs f xs	`thenDs` \ rs ->
     returnDs (r:rs)
 
+foldlDs :: (a -> b -> DsM a) -> a -> [b] -> DsM a
+
+foldlDs k z []     = returnDs z
+foldlDs k z (x:xs) = k z x `thenDs` \ r ->
+		     foldlDs k r xs
+
 mapAndUnzipDs :: (a -> DsM (b, c)) -> [a] -> DsM ([b], [c])
 
 mapAndUnzipDs f []     = returnDs ([], [])
@@ -142,32 +140,40 @@ functions are defined with it.  The difference in name-strings makes
 it easier to read debugging output.
 
 \begin{code}
-newLocalDs :: FAST_STRING -> Type -> DsM Id
-newLocalDs nm ty us loc mod_and_grp env warns
-  = case (getUnique us) of { assigned_uniq ->
-    (mkSysLocal nm assigned_uniq ty loc, warns) }
+newSysLocalDs, newFailLocalDs :: Type -> DsM Id
+newSysLocalDs ty us genv loc mod_and_grp warns
+  = case uniqFromSupply us of { assigned_uniq ->
+    (mkSysLocal assigned_uniq ty, warns) }
+
+newSysLocalsDs tys = mapDs newSysLocalDs tys
+
+newFailLocalDs ty us genv loc mod_and_grp warns
+  = case uniqFromSupply us of { assigned_uniq ->
+    (mkUserLocal (varOcc SLIT("fail")) assigned_uniq ty, warns) }
+	-- The UserLocal bit just helps make the code a little clearer
 
-newSysLocalDs	    = newLocalDs SLIT("ds")
-newSysLocalsDs tys  = mapDs (newLocalDs SLIT("ds")) tys
-newFailLocalDs	    = newLocalDs SLIT("fail")
+getUniqueDs :: DsM Unique
+getUniqueDs us genv loc mod_and_grp warns
+  = case (uniqFromSupply us) of { assigned_uniq ->
+    (assigned_uniq, warns) }
 
 duplicateLocalDs :: Id -> DsM Id
-duplicateLocalDs old_local us loc mod_and_grp env warns
-  = case (getUnique us) of { assigned_uniq ->
-    (mkIdWithNewUniq old_local assigned_uniq, warns) }
+duplicateLocalDs old_local us genv loc mod_and_grp warns
+  = case uniqFromSupply us of { assigned_uniq ->
+    (setIdUnique old_local assigned_uniq, warns) }
 
 cloneTyVarsDs :: [TyVar] -> DsM [TyVar]
-cloneTyVarsDs tyvars us loc mod_and_grp env warns
-  = case (getUniques (length tyvars) us) of { uniqs ->
-    (zipWithEqual "cloneTyVarsDs" cloneTyVar tyvars uniqs, warns) }
+cloneTyVarsDs tyvars us genv loc mod_and_grp warns
+  = case uniqsFromSupply (length tyvars) us of { uniqs ->
+    (zipWithEqual "cloneTyVarsDs" setTyVarUnique tyvars uniqs, warns) }
 \end{code}
 
 \begin{code}
 newTyVarsDs :: [TyVar] -> DsM [TyVar]
 
-newTyVarsDs tyvar_tmpls us loc mod_and_grp env warns
-  = case (getUniques (length tyvar_tmpls) us) of { uniqs ->
-    (zipWithEqual "newTyVarsDs" cloneTyVar tyvar_tmpls uniqs, warns) }
+newTyVarsDs tyvar_tmpls us genv loc mod_and_grp warns
+  = case uniqsFromSupply (length tyvar_tmpls) us of { uniqs ->
+    (zipWithEqual "newTyVarsDs" setTyVarUnique tyvar_tmpls uniqs, warns) }
 \end{code}
 
 We can also reach out and either set/grab location information from
@@ -175,48 +181,39 @@ the @SrcLoc@ being carried around.
 \begin{code}
 uniqSMtoDsM :: UniqSM a -> DsM a
 
-uniqSMtoDsM u_action us loc mod_and_grp env warns
-  = (u_action us, warns)
+uniqSMtoDsM u_action us genv loc mod_and_grp warns
+  = (initUs us u_action, warns)
 
 getSrcLocDs :: DsM SrcLoc
-getSrcLocDs us loc mod_and_grp env warns
+getSrcLocDs us genv loc mod_and_grp warns
   = (loc, warns)
 
 putSrcLocDs :: SrcLoc -> DsM a -> DsM a
-putSrcLocDs new_loc expr us old_loc mod_and_grp env warns
-  = expr us new_loc mod_and_grp env warns
+putSrcLocDs new_loc expr us genv old_loc mod_and_grp warns
+  = expr us genv new_loc mod_and_grp warns
 
-dsShadowWarn :: DsMatchContext -> DsM ()
-dsShadowWarn cxt us loc mod_and_grp env warns
-  = ((), warns `snocBag` (Shadowed, cxt))
+dsWarn :: WarnMsg -> DsM ()
+dsWarn warn us genv loc mod_and_grp warns = ((), warns `snocBag` warn)
 
-dsIncompleteWarn :: DsMatchContext -> DsM ()
-dsIncompleteWarn cxt us loc mod_and_grp env warns
-  = ((), warns `snocBag` (Incomplete, cxt))
 \end{code}
 
 \begin{code}
 getModuleAndGroupDs :: DsM (FAST_STRING, FAST_STRING)
-getModuleAndGroupDs us loc mod_and_grp env warns
+getModuleAndGroupDs us genv loc mod_and_grp warns
   = (mod_and_grp, warns)
 \end{code}
 
 \begin{code}
-type DsIdEnv = IdEnv Id
-
-extendEnvDs :: [(Id, Id)] -> DsM a -> DsM a
-
-extendEnvDs pairs then_do us loc mod_and_grp old_env warns
-  = then_do us loc mod_and_grp (growIdEnvList old_env pairs) warns
-
-lookupEnvDs :: Id -> DsM Id
-lookupEnvDs id us loc mod_and_grp env warns
-  = (case (lookupIdEnv env id) of
-      Nothing -> id
-      Just xx -> xx,
-     warns)
+dsLookupGlobalValue :: Name -> DsM Id
+dsLookupGlobalValue name us genv loc mod_and_grp warns
+  = case maybeWiredInIdName name of
+	Just id -> (id, warns)
+	Nothing -> (lookupWithDefaultUFM genv def name, warns)
+  where
+    def = pprPanic "tcLookupGlobalValue:" (ppr name)
 \end{code}
 
+
 %************************************************************************
 %*									*
 %* type synonym EquationInfo and access functions for its pieces	*
@@ -224,8 +221,6 @@ lookupEnvDs id us loc mod_and_grp env warns
 %************************************************************************
 
 \begin{code}
-data DsWarnFlavour = Shadowed | Incomplete deriving ()
-
 data DsMatchContext
   = DsMatchContext DsMatchKind [TypecheckedPat] SrcLoc
   | NoMatchContext
@@ -237,45 +232,10 @@ data DsMatchKind
   | LambdaMatch
   | PatBindMatch
   | DoBindMatch
+  | ListCompMatch
+  | LetMatch
   deriving ()
 
-pprDsWarnings :: PprStyle -> DsWarnings -> Doc
-pprDsWarnings sty warns
-  = vcat (map pp_warn (bagToList warns))
-  where
-    pp_warn (flavour, NoMatchContext) = sep [ptext SLIT("Warning: Some match is"), 
-					       case flavour of
-							Shadowed   -> ptext SLIT("shadowed")
-							Incomplete -> ptext SLIT("possibly incomplete")]
-
-    pp_warn (flavour, DsMatchContext kind pats loc)
-       = hang (hcat [ppr (PprForUser opt_PprUserLength) loc, ptext SLIT(": ")])
-	     4 (hang msg
-		     4 (pp_match kind pats))
-       where
-	msg = case flavour of
-		Shadowed   -> ptext SLIT("Warning: Pattern match(es) completely overlapped")     
-		Incomplete -> ptext SLIT("Warning: Possibly incomplete patterns")
-
-    pp_match (FunMatch fun) pats
-      = hsep [ptext SLIT("in the definition of function"), ppr sty fun]
-
-    pp_match CaseMatch pats
-      = hang (ptext SLIT("in a group of case alternatives beginning:"))
-	4 (ppr_pats pats)
-
-    pp_match PatBindMatch pats
-      = hang (ptext SLIT("in a pattern binding:"))
-	4 (ppr_pats pats)
-
-    pp_match LambdaMatch pats
-      = hang (ptext SLIT("in a lambda abstraction:"))
-	4 (ppr_pats pats)
-
-    pp_match DoBindMatch pats
-      = hang (ptext SLIT("in a `do' pattern binding:"))
-	4 (ppr_pats pats)
-
-    ppr_pats pats = pprQuote sty $ \ sty ->
-		    sep [sep (map (ppr sty) pats), ptext SLIT("-> ...")]
+pprDsWarnings :: DsWarnings -> SDoc
+pprDsWarnings warns = vcat (bagToList warns)
 \end{code}