:: SSMProgram :== [Instr]
:: GenError = Error String
:: Addressbook :== 'Map'.Map String Address
-:: Address = LAB String Int Int | ADDR Int
+:: Address = LAB String Int Int | ADDR Int Int
:: Gen a :== RWST () SSMProgram (Addressbook, [Label]) (Either GenError) a
labelStream :: [Label]
>>| g e2
>>| tell [Instr "stmh" [Lit 2] ""]
g (VarExpr _ (VarDef k fs)) = getAdressbook >>= \ab->case 'Map'.get k ab of
- Just (ADDR t) = tell [Instr "ldl" [Lit t] ""] >>| mapM_ g fs >>| pure ()
+ Just (ADDR t arity) = tell [Instr "ldl" [Lit t] ""] >>| mapM_ g fs >>| pure ()
Just (LAB l _ fn) = tell
[Instr "ldc" [Lit fn] ""
,Instr "sth" [] ""
[Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
,Instr "ldr" [Raw "RR"] ""])
//Identifier points to variable, thus higher order function
- Just (ADDR t) = liftT (Left $ Error "FunExpr to addr")
+ Just (ADDR t arity) = if (arity <> (length es))
+ ( liftT (Left $ Error "Variable is function and still not complete"))
+ ( liftT (Left $ Error "Variable is function and can be executed"))
Nothing = liftT (Left $ Error "Undefined function!!!")
jump :: String String -> Gen ()
jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
- Just (ADDR t) = liftT (Left $ Error "Address as jump???")
+ Just (ADDR t arity) = liftT (Left $ Error "Address as jump???")
instance g Stmt where
g (IfStmt cond th el) =
g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
- Just (ADDR t) = tell [Instr "stl" [Lit t] ""]
+ Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
g (FunStmt k es fs) = mapM_ g es
>>| jump "bsr" k
>>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
foldVarDecl :: Int VarDecl -> Gen Int
foldVarDecl x (VarDecl _ mt k e) = g e
>>| annote x k
- >>| updateAdressbook (extend k (ADDR x))
+ >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
>>| pure (x + 1)
-addVars :: [String] -> (Addressbook -> Addressbook)
-addVars [] = id
-addVars [x:xs] = \ab->extend x (ADDR (-2 - (length xs))) (addVars xs ab)
+arity :: Type -> Int
+arity (_ ->> x) = 1 + arity x
+arity _ = 0
+
+addVars :: Type [String] -> (Addressbook -> Addressbook)
+addVars _ [] = id
+addVars (t ->> ts) [x:xs] = \ab->
+ extend x (ADDR (-2 - (length xs)) (arity t)) (addVars t xs ab)
instance g FunDecl where
- g (FunDecl _ k args _ vds stms) =
+ g (FunDecl _ k args mt vds stms) =
//varDecls can call the enclosing function, so first reserve a label for it
getAdressbook >>= \oldMap ->
- updateAdressbook (addVars args) >>|
+ updateAdressbook (addVars (fromJust mt) args) >>|
tell [Lab k] >>|
tell [Instr "link" [Lit 0] ""] >>|
//add the vars