Remove very dead Java backend code.

[ghc-hetmet.git] / compiler / basicTypes / NameSet.lhs

diff --git a/compiler/basicTypes/NameSet.lhs b/compiler/basicTypes/NameSet.lhs
index 7eb5da5..bef9e92 100644 (file)
--- a/compiler/basicTypes/NameSet.lhs
+++ b/compiler/basicTypes/NameSet.lhs
@@ -30,9 +30,13 @@ module NameSet (
     ) where
 
 #include "HsVersions.h"
+#include "Typeable.h"
 
 import Name
 import UniqSet
+import Util
+
+import Data.Data
 \end{code}
 
 %************************************************************************
@@ -44,6 +48,19 @@ import UniqSet
 \begin{code}
 type NameSet = UniqSet Name
 
+-- TODO: These Data/Typeable instances look very dubious. Surely either
+-- UniqFM should have the instances, or this should be a newtype?
+
+nameSetTc :: TyCon
+nameSetTc = mkTyCon "NameSet"
+instance Typeable NameSet where { typeOf _ = mkTyConApp nameSetTc [] }
+
+instance Data NameSet where
+  gfoldl k z s = z mkNameSet `k` nameSetToList s -- traverse abstractly
+  toConstr _   = abstractConstr "NameSet"
+  gunfold _ _  = error "gunfold"
+  dataTypeOf _ = mkNoRepType "NameSet"
+
 emptyNameSet      :: NameSet
 unitNameSet       :: Name -> NameSet
 addListToNameSet   :: NameSet -> [Name] -> NameSet
@@ -142,6 +159,7 @@ type Uses = NameSet
 type DefUse  = (Maybe Defs, Uses)
 
 -- | A number of 'DefUse's in dependency order: earlier 'Defs' scope over later 'Uses'
+--   In a single (def, use) pair, the defs also scope over the uses
 type DefUses = [DefUse]
 
 emptyDUs :: DefUses
@@ -162,17 +180,16 @@ duDefs dus = foldr get emptyNameSet dus
     get (Nothing, _u1) d2 = d2
     get (Just d1, _u1) d2 = d1 `unionNameSets` d2
 
-duUses :: DefUses -> Uses
--- ^ Just like 'allUses', but 'Defs' are not eliminated from the 'Uses' returned
-duUses dus = foldr get emptyNameSet dus
+allUses :: DefUses -> Uses
+-- ^ Just like 'duUses', but 'Defs' are not eliminated from the 'Uses' returned
+allUses dus = foldr get emptyNameSet dus
   where
     get (_d1, u1) u2 = u1 `unionNameSets` u2
 
-allUses :: DefUses -> Uses
+duUses :: DefUses -> Uses
 -- ^ Collect all 'Uses', regardless of whether the group is itself used,
 -- but remove 'Defs' on the way
-allUses dus
-  = foldr get emptyNameSet dus
+duUses dus = foldr get emptyNameSet dus
   where
     get (Nothing,   rhs_uses) uses = rhs_uses `unionNameSets` uses
     get (Just defs, rhs_uses) uses = (rhs_uses `unionNameSets` uses)
@@ -189,7 +206,7 @@ findUses dus uses
        = rhs_uses `unionNameSets` uses
     get (Just defs, rhs_uses) uses
        | defs `intersectsNameSet` uses         -- Used
-       || not (all (reportIfUnused . nameOccName) (nameSetToList defs))
+       || any (startsWithUnderscore . nameOccName) (nameSetToList defs)
                -- At least one starts with an "_", 
                -- so treat the group as used
        = rhs_uses `unionNameSets` uses