X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDsUtils.lhs;h=1465554175fb7fc967410a49a80e7af88307e12d;hb=9d7da331989abcd1844e9d03b8d1e4163796fa85;hp=671697b2591e4e6e840901627efa8f9a1194bb10;hpb=6d36af4aff6e12afa50dae2fad3993c385f8081d;p=ghc-hetmet.git

diff --git a/ghc/compiler/deSugar/DsUtils.lhs b/ghc/compiler/deSugar/DsUtils.lhs
index 671697b..1465554 100644
--- a/ghc/compiler/deSugar/DsUtils.lhs
+++ b/ghc/compiler/deSugar/DsUtils.lhs
@@ -16,8 +16,8 @@ module DsUtils (
 	cantFailMatchResult, alwaysFailMatchResult,
 	extractMatchResult, combineMatchResults, 
 	adjustMatchResult,  adjustMatchResultDs,
-	mkCoLetMatchResult,
-	mkGuardedMatchResult, 
+	mkCoLetMatchResult, mkGuardedMatchResult, 
+	matchCanFail,
 	mkCoPrimCaseMatchResult, mkCoAlgCaseMatchResult,
 	wrapBind, wrapBinds,
 
@@ -29,7 +29,7 @@ module DsUtils (
 	mkTupleType, mkTupleCase, mkBigCoreTup,
 	mkCoreTup, mkCoreTupTy,
 	
-	dsReboundNames, lookupReboundName,
+	dsSyntaxTable, lookupEvidence,
 
 	selectSimpleMatchVarL, selectMatchVars
     ) where
@@ -69,11 +69,12 @@ import PrelNames	( unpackCStringName, unpackCStringUtf8Name,
 			  plusIntegerName, timesIntegerName, smallIntegerDataConName, 
 			  lengthPName, indexPName )
 import Outputable
-import UnicodeUtil      ( intsToUtf8 )
 import SrcLoc		( Located(..), unLoc )
 import Util             ( isSingleton, notNull, zipEqual, sortWith )
 import ListSetOps	( assocDefault )
 import FastString
+
+import Data.Char	( ord )
 \end{code}
 
 
@@ -85,11 +86,11 @@ import FastString
 %************************************************************************
 
 \begin{code}
-dsReboundNames :: ReboundNames Id 
+dsSyntaxTable :: SyntaxTable Id 
 	       -> DsM ([CoreBind], 	-- Auxiliary bindings
 		       [(Name,Id)])	-- Maps the standard name to its value
 
-dsReboundNames rebound_ids
+dsSyntaxTable rebound_ids
   = mapAndUnzipDs mk_bind rebound_ids	`thenDs` \ (binds_s, prs) ->
     return (concat binds_s, prs)
   where
@@ -101,11 +102,11 @@ dsReboundNames rebound_ids
      	   newSysLocalDs (exprType rhs)		`thenDs` \ id ->
      	   return ([NonRec id rhs], (std_name, id))
 
-lookupReboundName :: [(Name,Id)] -> Name -> CoreExpr
-lookupReboundName prs std_name
-  = Var (assocDefault (mk_panic std_name) prs std_name)
+lookupEvidence :: [(Name, Id)] -> Name -> Id
+lookupEvidence prs std_name
+  = assocDefault (mk_panic std_name) prs std_name
   where
-    mk_panic std_name = pprPanic "dsReboundNames" (ptext SLIT("Not found:") <+> ppr std_name)
+    mk_panic std_name = pprPanic "dsSyntaxTable" (ptext SLIT("Not found:") <+> ppr std_name)
 \end{code}
 
 
@@ -198,6 +199,10 @@ shiftEqns eqns = [ eqn { eqn_pats = tail (eqn_pats eqn) } | eqn <- eqns ]
 Functions on MatchResults
 
 \begin{code}
+matchCanFail :: MatchResult -> Bool
+matchCanFail (MatchResult CanFail _)  = True
+matchCanFail (MatchResult CantFail _) = False
+
 alwaysFailMatchResult :: MatchResult
 alwaysFailMatchResult = MatchResult CanFail (\fail -> returnDs fail)
 
@@ -325,13 +330,13 @@ mkCoAlgCaseMatchResult var ty match_alts
 
 	-- Stuff for parallel arrays
 	-- 
-	-- * the following is to desugar cases over fake constructors for
+	--  * the following is to desugar cases over fake constructors for
 	--   parallel arrays, which are introduced by `tidy1' in the `PArrPat'
 	--   case
 	--
 	-- Concerning `isPArrFakeAlts':
 	--
-	-- * it is *not* sufficient to just check the type of the type
+	--  * it is *not* sufficient to just check the type of the type
 	--   constructor, as we have to be careful not to confuse the real
 	--   representation of parallel arrays with the fake constructors;
 	--   moreover, a list of alternatives must not mix fake and real
@@ -407,6 +412,7 @@ mkErrorAppDs err_id ty msg
     let
 	full_msg = showSDoc (hcat [ppr src_loc, text "|", text msg])
 	core_msg = Lit (mkStringLit full_msg)
+	-- mkStringLit returns a result of type String#
     in
     returnDs (mkApps (Var err_id) [Type ty, core_msg])
 \end{code}
@@ -464,7 +470,7 @@ mkSmallIntegerLit small_integer_data_con i = mkConApp small_integer_data_con [mk
 mkStringExpr str = mkStringExprFS (mkFastString str)
 
 mkStringExprFS str
-  | nullFastString str
+  | nullFS str
   = returnDs (mkNilExpr charTy)
 
   | lengthFS str == 1
@@ -473,17 +479,17 @@ mkStringExprFS str
     in
     returnDs (mkConsExpr charTy the_char (mkNilExpr charTy))
 
-  | all safeChar int_chars
+  | all safeChar chars
   = dsLookupGlobalId unpackCStringName	`thenDs` \ unpack_id ->
     returnDs (App (Var unpack_id) (Lit (MachStr str)))
 
   | otherwise
   = dsLookupGlobalId unpackCStringUtf8Name	`thenDs` \ unpack_id ->
-    returnDs (App (Var unpack_id) (Lit (MachStr (mkFastString (intsToUtf8 int_chars)))))
+    returnDs (App (Var unpack_id) (Lit (MachStr str)))
 
   where
-    int_chars = unpackIntFS str
-    safeChar c = c >= 1 && c <= 0xFF
+    chars = unpackFS str
+    safeChar c = ord c >= 1 && ord c <= 0xFF
 \end{code}