diff options
| author | bringert <bringert@cs.chalmers.se> | 2005-11-29 15:48:13 +0000 |
|---|---|---|
| committer | bringert <bringert@cs.chalmers.se> | 2005-11-29 15:48:13 +0000 |
| commit | eef20fa404f11fda0b9f73da1a3ee41db3201062 (patch) | |
| tree | f03879bedcf2a7885b092d18581f11a994a008be /src/Transfer/SyntaxToCore.hs | |
| parent | 2be80a7e3b4834bd3146ac9d2f27190fd0689d27 (diff) | |
Added meta variables to transfer front-end and core.
Diffstat (limited to 'src/Transfer/SyntaxToCore.hs')
| -rw-r--r-- | src/Transfer/SyntaxToCore.hs | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/src/Transfer/SyntaxToCore.hs b/src/Transfer/SyntaxToCore.hs index ff11b35b6..637623c83 100644 --- a/src/Transfer/SyntaxToCore.hs +++ b/src/Transfer/SyntaxToCore.hs @@ -17,7 +17,10 @@ import Debug.Trace type C a = State CState a -type CState = Integer +data CState = CState { + nextVar :: Integer, + nextMeta :: Integer + } @@ -25,7 +28,8 @@ declsToCore :: [Decl] -> [Decl] declsToCore m = evalState (declsToCore_ m) newState declsToCore_ :: [Decl] -> C [Decl] -declsToCore_ = deriveDecls +declsToCore_ = numberMetas + >>> deriveDecls >>> replaceCons >>> compilePattDecls >>> desugar @@ -37,7 +41,25 @@ optimize = removeUnusedVariables >>> betaReduce newState :: CState -newState = 0 +newState = CState { + nextVar = 0, + nextMeta = 0 + } + +-- +-- * Number meta variables +-- + +numberMetas :: [Decl] -> C [Decl] +numberMetas = mapM f + where + f :: Tree a -> C (Tree a) + f t = case t of + EMeta -> do + st <- get + put (st { nextMeta = nextMeta st + 1}) + return $ EVar $ Ident $ "?" ++ show (nextMeta st) + _ -> composOpM f t -- -- * Pattern equations @@ -178,6 +200,7 @@ replaceCons ds = mapM f ds -- redexes produced here. EVar id | isCons id -> do let Just n = Map.lookup id cs + -- abstract n (apply t) vs <- freshIdents n let c = apply t (map EVar vs) return $ foldr (EAbs . VVar) c vs @@ -354,9 +377,9 @@ abstractType ts f = -- code, and which has not been generated before. freshIdent :: C Ident freshIdent = do - i <- get - put (i+1) - return (Ident ("x_"++show i)) + st <- get + put (st { nextVar = nextVar st + 1 }) + return (Ident ("x_"++show (nextVar st))) freshIdents :: Int -> C [Ident] freshIdents n = replicateM n freshIdent |