implementation module gen
-import AST
import StdMisc
+import StdList
+import StdOverloaded
+import StdString
+from StdFunc import id, const
+import StdTuple
+import StdEnum
+
+import Data.Func
+import qualified Data.Map as Map
+import Data.List
+import Data.Either
+import Data.Tuple
+import Data.Functor
+import Data.Monoid
+import Data.Maybe
+import Control.Applicative
+import Control.Monad
+import Control.Monad.Trans
+from Text import class Text(concat), instance Text String
+
+import AST
+import RWST
+
+TRUE :== -1
+FALSE :== 0
+:: Instr = Instr String [Arg] String
+ | Lab Label
+:: Label :== String
+:: Arg = L Label | Lit Int | Raw String
+:: SSMProgram :== [Instr]
+:: GenError = Error String
+:: Addressbook :== 'Map'.Map String Address
+:: Address = LAB String Int Int | ADDR Int Int
+:: Gen a :== RWST () SSMProgram (Addressbook, [Label]) (Either GenError) a
+
+labelStream :: [Label]
+labelStream = ["lbl_" +++ toString i\\i<-[1..]]
+
+defaultAddressBook :: [FunDecl] -> Addressbook
+defaultAddressBook fd = extend "1printint" (LAB "1printint" 1 0)
+ $ extend "1printchar" (LAB "1printchar" 1 1)
+ $ extend "read" (LAB "read" 0 2)
+ $ extend "1readint" (LAB "1readint" 0 3)
+ $ extend "isEmpty" (LAB "isempty" 1 4)
+ $ addFuncs fd 5
+ where
+ addFuncs [] _ = 'Map'.newMap
+ addFuncs [(FunDecl _ k args _ _ _):xs] n =
+ extend k (LAB k (length args) n) $ addFuncs xs (n+1)
+
+gen :: AST -> Either String String
+gen (AST fds) = case evalRWST prog () (defaultAddressBook fds, labelStream) of
+ Left (Error e) = Left e
+ Right (_, p) = Right $ toString p
+ where
+ prog = tell [
+ Instr "bsr" [L "main"] "",
+ Instr "halt" [] ""
+ ] >>| tell (programContext fds)
+ >>| mapM_ g fds
+
+programContext :: [FunDecl] -> SSMProgram
+programContext x = [Lab "1func"
+ :fS ["1printint" ,"1printchar"
+ ,"read" ,"1readint"
+ ,"isEmpty":map (\(FunDecl _ k _ _ _ _)->k) x] 0] ++ context
+ where
+
+ fS :: [String] Int -> SSMProgram
+ fS [] _ = []
+ fS [k:xs] n = [
+ Lab $ "1next" +++ toString n
+ ,Instr "ldr" [Raw "R5"] ""
+ ,Instr "ldc" [Lit n] $ "branch to: " +++ k
+ ,Instr "eq" [] ""
+ ,Instr "brf" [L $ "1next" +++ (toString $ n + 1)] ""
+ ,Instr "bra" [L k] ""
+ :fS xs $ n+1]
+ context :: SSMProgram
+ context = [Lab "1printint"
+ ,Instr "link" [Lit 0] ""
+ ,Instr "ldl" [Lit -2] "load first argument"
+ ,Instr "trap" [Lit 0] "print int"
+ ,Instr "unlink" [] ""
+ ,Instr "ret" [] ""
+ ,Lab "1printchar"
+ ,Instr "link" [Lit 0] ""
+ ,Instr "ldl" [Lit -2] "load first argument"
+ ,Instr "trap" [Lit 1] "print char"
+ ,Instr "unlink" [] ""
+ ,Instr "ret" [] ""
+ ,Lab "read"
+ ,Instr "link" [Lit 0] ""
+ ,Instr "trap" [Lit 11] "read char"
+ ,Instr "str" [Raw "RR"] ""
+ ,Instr "unlink" [] ""
+ ,Instr "ret" [] ""
+ ,Lab "isempty"
+ ,Instr "link" [Lit 0] ""
+ ,Instr "ldl" [Lit -2] "load prt to list"
+ ,Instr "lda" [Lit 0] "derefrence ptr"
+ ,Instr "ldc" [Lit 0] ""
+ ,Instr "eq" [] "test for null pointer"
+ ,Instr "str" [Raw "RR"] ""
+ ,Instr "unlink" [] ""
+ ,Instr "ret" [] ""
+ ,Lab "read"
+ ]
+
+getAdressbook :: Gen Addressbook
+getAdressbook = gets fst
+
+updateAdressbook :: (Addressbook -> Addressbook) -> Gen Addressbook
+updateAdressbook f = modify (appFst f) >>| getAdressbook
+
+extend :: String Address Addressbook -> Addressbook
+extend k pl g = 'Map'.put k pl g
+
+fresh :: Gen Label
+fresh = gets snd >>= \vars->
+ modify (appSnd $ const $ tail vars) >>|
+ pure (head vars)
+
+class g a :: a -> Gen ()
+
+instance g Op1 where
+ g UnNegation = tell [Instr "not" [] ""]
+ g UnMinus = tell [Instr "neg" [] ""]
+
+instance g Op2 where
+ g o = tell [Instr s [] ""]
+ where
+ s = case o of
+ BiPlus = "add"
+ BiMinus = "sub"
+ BiTimes = "mul"
+ BiDivide = "div"
+ BiMod = "mod"
+ BiEquals = "eq"
+ BiLesser = "lt"
+ BiGreater = "gt"
+ BiLesserEq = "le"
+ BiGreaterEq = "ge"
+ BiUnEqual = "ne"
+ BiAnd = "and"
+ BiOr = "or"
+ BiCons = abort "Shit, Cons, how to deal with this?"
+
+instance g FieldSelector where
+ g FieldFst = tell [Instr "lda" [Lit -1] "fst"]
+ g FieldSnd = tell [Instr "lda" [Lit 0] "snd"]
+ g FieldHd = tell [Instr "lda" [Lit -1] "hd"]
+ g FieldTl = tell [Instr "lda" [Lit 0] "tl"]
+
+instance g Expr where
+ g (IntExpr _ i) = tell [Instr "ldc" [Lit i] ""]
+ g (CharExpr _ c) = tell [Instr "ldc" [Lit (toInt c)] ""]
+ g (BoolExpr _ b) = tell [Instr "ldc" [Lit (if b TRUE FALSE)] ""]
+ g (EmptyListExpr _) = tell [Instr "ldc" [Lit 0] ""]
+ >>| tell [Instr "sth" [] ""]
+ g (Op1Expr _ o e) = g e >>| g o
+ g (Op2Expr _ e1 BiCons e2) = g e2 >>| g e1
+ >>| tell [Instr "sth" [] ""]
+ >>| tell [Instr "ajs" [Lit -1] ""]
+ >>| tell [Instr "sth" [] ""]
+ g (Op2Expr _ e1 op e2) = g e1 >>| g e2 >>| g op
+ g (TupleExpr _ (e1,e2)) = g e1
+ >>| g e2
+ >>| tell [Instr "stmh" [Lit 2] ""]
+ g (VarExpr _ (VarDef k fs)) = getAdressbook >>= \ab->case 'Map'.get k ab of
+ Just (ADDR t arity) = tell [Instr "ldl" [Lit t] ""] >>| mapM_ g fs >>| pure ()
+ Just (LAB l _ fn) = tell
+ [Instr "ldc" [Lit fn] ""
+ ,Instr "ldc" [Lit 0] ""
+ ,Instr "stmh" [Lit 2] ""]
+ g (FunExpr _ k es fs) = getAdressbook >>= \ab->case 'Map'.get k ab of
+ //Identifier points to function
+ Just (LAB l arity fn) = if (arity <> (length es))
+ //Function is not complete
+ ( tell
+ [Instr "ldc" [Lit fn] "Store function number"
+ ,Instr "sth" [] ""
+ ,Instr "ldc" [Lit $ length es] "Store arity"
+ ,Instr "sth" [] ""
+ ,Instr "ajs" [Lit -1] ""]
+ >>| mapM_ g es
+ >>| if (isEmpty es) (pure ()) (tell
+ [Instr "stmh" [Lit $ length es] "Store arguments"
+ ,Instr "ajs" [Lit -1] ""]))
+ //Function is complete
+ ( mapM_ g es
+ >>| jump "bsr" k
+ >>| tell
+ [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
+ ,Instr "ldr" [Raw "RR"] ""])
+ //Identifier points to variable, thus higher order function
+ Just (ADDR t arity) = if (arity <> (length es))
+ //Function is still not complete
+ ( fresh >>= \finish->fresh >>= \start->tell [
+ //Store function number
+ Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
+ ,Instr "ldh" [Lit 0] "get function number"
+ ,Instr "sth" [] "Store"
+ //Store function arity
+ ,Instr "ldl" [Lit t] "get pointer again"
+ ,Instr "ldh" [Lit 1] "get function arity"
+ ,Instr "ldc" [Lit $ length es] "add argument number"
+ ,Instr "add" [] "add"
+ ,Instr "sth" [] "Store"
+ ,Instr "ajs" [Lit -1] "Adjust pointer"
+ //load the arguments
+ ,Instr "ldl" [Lit t] ""
+ ,Instr "ldh" [Lit 1] "Load available arguments"
+ ,Instr "str" [Raw "R5"] "Store available args in register"
+ ,Instr "ldc" [Lit 0] "Store offset"
+ ,Instr "str" [Raw "R6"] "Store offset in register"
+ ,Lab start
+ ,Instr "ldr" [Raw "R5"] ""
+ ,Instr "ldc" [Lit 0] ""
+ ,Instr "eq" [] ""
+ ,Instr "brt" [L finish] "Done pushing arg, bye"
+ //Load heapadress
+ ,Instr "ldl" [Lit t] ""
+ ,Instr "ldr" [Raw "R6"] ""
+ ,Instr "add" [] "Corrected heapaddress"
+ ,Instr "ldh" [Lit 2] "Load argument"
+ ,Instr "sth" [] "And store it immediatly after"
+ //Decrease available arguments
+ ,Instr "ldr" [Raw "R5"] ""
+ ,Instr "ldc" [Lit 1] ""
+ ,Instr "sub" [] ""
+ ,Instr "str" [Raw "R5"] ""
+ //Increase available arguments
+ ,Instr "ldr" [Raw "R6"] ""
+ ,Instr "ldc" [Lit 1] ""
+ ,Instr "add" [] ""
+ ,Instr "str" [Raw "R6"] ""
+ ,Instr "bra" [L start] ""
+ ,Lab finish
+ ]
+ >>| mapM_ g es
+ >>| tell
+ [Instr "stmh" [Lit $ length es] "Store extra args"
+ ,Instr "ajs" [Lit -1] ""]
+ )
+ //Function is complete
+ ( fresh >>= \finish->fresh >>= \start->tell [
+ Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
+ ,Instr "ldh" [Lit 1] "Load available arguments"
+ ,Instr "str" [Raw "R5"] "Store available args in register"
+ ,Instr "ldc" [Lit 0] "Store offset"
+ ,Instr "str" [Raw "R6"] "Store offset in register"
+
+ ,Lab start
+ ,Instr "ldr" [Raw "R5"] ""
+ ,Instr "ldc" [Lit 0] ""
+ ,Instr "eq" [] ""
+ ,Instr "brt" [L finish] "Done pushing arg, bye"
+ //Load heapadress
+ ,Instr "ldl" [Lit t] ""
+ ,Instr "ldr" [Raw "R6"] ""
+ ,Instr "add" [] "Corrected heapaddress"
+ ,Instr "ldh" [Lit 2] "Load argument"
+ //Decrease available arguments
+ ,Instr "ldr" [Raw "R5"] ""
+ ,Instr "ldc" [Lit 1] ""
+ ,Instr "sub" [] ""
+ ,Instr "str" [Raw "R5"] ""
+ //Increase available arguments
+ ,Instr "ldr" [Raw "R6"] ""
+ ,Instr "ldc" [Lit 1] ""
+ ,Instr "add" [] ""
+ ,Instr "str" [Raw "R6"] ""
+ ,Instr "bra" [L start] ""
+ ,Lab finish
+ ]
+ >>| mapM_ g es
+ >>| tell
+ [Instr "ldl" [Lit t] ""
+ ,Instr "ldh" [Lit 0] "Get function number"
+ ,Instr "str" [Raw "R5"] ""
+ ,Instr "bsr" [L "1func"] ""
+ ,Instr "ldr" [Raw "MP"] ""
+ ,Instr "ldc" [Lit t] ""
+ ,Instr "add" [] ""
+ ,Instr "str" [Raw "SP"] ""
+ ,Instr "ldr" [Raw "RR"] ""
+ ]
+ )
+ 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 arity) = abort "NO ADDRESS JUMPING FFS"
+
+instance g Stmt where
+ g (IfStmt cond th el) =
+ fresh >>= \elseLabel->
+ fresh >>= \endLabel->
+ g cond >>|
+ tell [Instr "brf" [L elseLabel] "branch else"] >>|
+ mapM_ g th >>|
+ tell [Instr "bra" [L endLabel] "branch end if"] >>|
+ tell [Lab elseLabel] >>|
+ mapM_ g el >>|
+ tell [Lab endLabel]
+ g (WhileStmt cond th) =
+ fresh >>= \startLabel->
+ fresh >>= \endLabel ->
+ tell [Lab startLabel] >>|
+ g cond >>|
+ tell [Instr "brf" [L endLabel] "branch end while"] >>|
+ mapM_ g th >>|
+ tell [Instr "bra" [L startLabel] "branch start while"] >>|
+ tell [Lab endLabel]
+ g (AssStmt (VarDef k fs) e) =
+ 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 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
+ >>| mapM_ g fs
+ >>| pure ()
+ g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
+ >>| tell [Instr "ret" [] ""]
+ g (ReturnStmt (Just e)) = g e
+ >>| tell [Instr "str" [Raw "RR"] ""]
+ >>| g (ReturnStmt Nothing)
+
+foldVarDecl :: Int VarDecl -> Gen Int
+foldVarDecl x (VarDecl _ mt k e) = g e
+ >>| annote x k
+ >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
+ >>| pure (x + 1)
+
+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 ts xs ab)
+addVars t [x] = \ab->
+ extend x (ADDR -2 0) ab
+
+instance g FunDecl where
+ g (FunDecl _ k args mt vds stms) =
+ //varDecls can call the enclosing function, so first reserve a label for it
+ getAdressbook >>= \oldMap ->
+ updateAdressbook (addVars (fromJust mt) args) >>|
+ tell [Lab k] >>|
+ tell [Instr "link" [Lit 0] ""] >>|
+ //add the vars
+ foldM foldVarDecl 1 vds >>|
+ //and the statements
+ mapM_ g stms >>|
+ //Ugly hack to always return
+ g (ReturnStmt Nothing) >>|
+ updateAdressbook (const oldMap) >>| pure ()
+
+annote :: Int String -> Gen ()
+annote pos key =
+ tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "green", Raw key] ""]
+
+class print a :: a -> [String]
+
+instance print Instr where
+ print (Lab l) = [l, ":", "\n"]
+ print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
+
+instance print [Arg] where
+ print args = (map toString args)
+
+instance toString Arg where
+ toString (L l) = l
+ toString (Lit int) = toString int
+ toString (Raw s) = s
-gen :: AST -> String
-gen _ = "dummy"
\ No newline at end of file
+instance toString SSMProgram where
+ toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p
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