gen.icl

   1 implementation module gen
   2
   3 import StdMisc
   4 import StdList
   5 import StdOverloaded
   6 import StdString
   7 from StdFunc import id, const
   8 import StdTuple
   9 import StdEnum
  10
  11 import Data.Func
  12 import qualified Data.Map as Map
  13 import Data.List
  14 import Data.Either
  15 import Data.Tuple
  16 import Data.Functor
  17 import Data.Monoid
  18 import Data.Maybe
  19 import Control.Applicative
  20 import Control.Monad
  21 import Control.Monad.Trans
  22 from Text import class Text(concat), instance Text String
  23
  24 import AST
  25 import RWST
  26
  27 TRUE :== -1
  28 FALSE :== 0
  29 :: Instr    = Instr String [Arg] String
  30             | Lab Label
  31 :: Label :== String
  32 :: Arg = L Label | Lit Int | Raw String
  33 :: SSMProgram :== [Instr]
  34 :: GenError = Error String
  35 :: Addressbook :== 'Map'.Map String Address
  36 :: Address = LAB String Int Int | ADDR Int Int
  37 :: Gen a :== RWST () SSMProgram (Addressbook, [Label]) (Either GenError) a
  38
  39 labelStream :: [Label]
  40 labelStream = ["lbl_" +++ toString i\\i<-[1..]]
  41
  42 defaultAddressBook :: [FunDecl] -> Addressbook
  43 defaultAddressBook fd = extend "1printint" (LAB "1printint" 1 0)
  44         $ extend "1printchar" (LAB "1printchar" 1 1)
  45         $ extend "read" (LAB "read" 0 2)
  46         $ extend "1readint" (LAB "1readint" 0 3)
  47         $ extend "isEmpty" (LAB "isempty" 1 4)
  48         $ addFuncs fd 5
  49         where
  50                 addFuncs [] _ = 'Map'.newMap
  51                 addFuncs [(FunDecl _ k args _ _ _):xs] n =
  52                         extend k (LAB k (length args) n) $ addFuncs xs (n+1)
  53
  54 gen :: AST -> Either String String
  55 gen (AST fds) = case evalRWST prog () (defaultAddressBook fds, labelStream) of
  56             Left (Error e) = Left e
  57             Right (_, p) = Right $ toString p
  58     where
  59         prog = tell [
  60                         Instr "bsr" [L "main"] "",
  61                         Instr "halt" [] ""
  62                         ] >>| tell (programContext fds)
  63             >>| mapM_ g fds
  64
  65 programContext :: [FunDecl] -> SSMProgram
  66 programContext x = [Lab "1func"
  67                                 :fS ["1printint" ,"1printchar"
  68                                         ,"read" ,"1readint"
  69                                         ,"isEmpty":map (\(FunDecl _ k _ _ _ _)->k) x] 0] ++ context
  70         where
  71
  72                 fS :: [String] Int -> SSMProgram
  73                 fS [] _ = []
  74                 fS [k:xs] n = [
  75                          Lab $ "1next" +++ toString n
  76                         ,Instr "ldr" [Raw "R5"] ""
  77                         ,Instr "ldc" [Lit n] $ "branch to: " +++ k
  78                         ,Instr "eq" [] ""
  79                         ,Instr "brf" [L $ "1next" +++ (toString $ n + 1)] ""
  80                         ,Instr "bra" [L k] ""
  81                         :fS xs $ n+1]
  82                 context :: SSMProgram
  83                 context =   [Lab "1printint"
  84                     ,Instr "link" [Lit 0] ""
  85                     ,Instr "ldl" [Lit -2] "load first argument"
  86                                         ,Instr "trap" [Lit 0] "print int"
  87                     ,Instr "unlink" [] ""
  88                     ,Instr "ret" [] ""
  89                                         ,Lab "1printchar"
  90                     ,Instr "link" [Lit 0] ""
  91                     ,Instr "ldl" [Lit -2] "load first argument"
  92                                         ,Instr "trap" [Lit 1] "print char"
  93                     ,Instr "unlink" [] ""
  94                     ,Instr "ret" [] ""
  95                     ,Lab "read"
  96                     ,Instr "link" [Lit 0] ""
  97                                         ,Instr "trap" [Lit 11] "read char"
  98                     ,Instr "str" [Raw "RR"] ""
  99                     ,Instr "unlink" [] ""
 100                     ,Instr "ret" [] ""
 101                     ,Lab "isempty"
 102                     ,Instr "link" [Lit 0] ""
 103                     ,Instr "ldl" [Lit -2] "load prt to list"
 104                     ,Instr "lda" [Lit 0] "derefrence ptr"
 105                     ,Instr "ldc" [Lit 0] ""
 106                     ,Instr "eq" [] "test for null pointer"
 107                     ,Instr "str" [Raw "RR"] ""
 108                     ,Instr "unlink" [] ""
 109                     ,Instr "ret" [] ""
 110                     ,Lab "read"
 111                     ]
 112
 113 getAdressbook :: Gen Addressbook
 114 getAdressbook = gets fst
 115
 116 updateAdressbook :: (Addressbook -> Addressbook) -> Gen Addressbook
 117 updateAdressbook f = modify (appFst f) >>| getAdressbook
 118
 119 extend :: String Address Addressbook -> Addressbook
 120 extend k pl g = 'Map'.put k pl g
 121
 122 fresh :: Gen Label
 123 fresh = gets snd >>= \vars->
 124         modify (appSnd $ const $ tail vars) >>|
 125         pure (head vars)
 126
 127 class g a :: a -> Gen ()
 128
 129 instance g Op1 where
 130         g UnNegation = tell [Instr "not" [] ""]
 131         g UnMinus = tell [Instr "neg" [] ""]
 132
 133 instance g Op2 where
 134         g o = tell [Instr s [] ""]
 135                 where
 136                         s = case o of
 137                     BiPlus = "add"
 138                                 BiMinus = "sub"
 139                     BiTimes = "mul"
 140                     BiDivide = "div"
 141                     BiMod = "mod"
 142                     BiEquals = "eq"
 143                     BiLesser = "lt"
 144                     BiGreater = "gt"
 145                     BiLesserEq = "le"
 146                     BiGreaterEq = "ge"
 147                     BiUnEqual = "ne"
 148                     BiAnd =  "and"
 149                     BiOr = "or"
 150                     BiCons = abort "Shit, Cons, how to deal with this?"
 151
 152 instance g FieldSelector where
 153         g FieldFst = tell [Instr "lda" [Lit -1] "fst"]
 154         g FieldSnd = tell [Instr "lda" [Lit 0] "snd"]
 155         g FieldHd = tell [Instr "lda" [Lit -1] "hd"]
 156         g FieldTl = tell [Instr "lda" [Lit 0] "tl"]
 157
 158 instance g Expr where
 159     g (IntExpr _ i) = tell [Instr "ldc" [Lit i] ""]
 160     g (CharExpr _ c) = tell [Instr "ldc" [Lit (toInt c)] ""]
 161         g (BoolExpr _ b) = tell [Instr "ldc" [Lit (if b TRUE FALSE)] ""]
 162     g (EmptyListExpr _) = tell [Instr "ldc" [Lit 0] ""]
 163                 >>| tell [Instr "sth" [] ""]
 164     g (Op1Expr _ o e) = g e >>| g o
 165     g (Op2Expr _ e1 BiCons e2) = g e2 >>| g e1
 166                 >>| tell [Instr "sth" [] ""]
 167                 >>| tell [Instr "ajs" [Lit -1] ""]
 168                 >>| tell [Instr "sth" [] ""]
 169     g (Op2Expr _ e1 op e2) = g e1 >>| g e2 >>| g op
 170     g (TupleExpr _ (e1,e2)) = g e1
 171                 >>| g e2
 172                 >>| tell [Instr "stmh" [Lit 2] ""]
 173     g (VarExpr _ (VarDef k fs)) = getAdressbook >>= \ab->case 'Map'.get k ab of
 174                 Just (ADDR t arity) = tell [Instr "ldl" [Lit t] ""] >>| mapM_ g fs >>| pure ()
 175                 Just (LAB l _ fn) = tell
 176                         [Instr "ldc" [Lit fn] ""
 177                         ,Instr "sth" [] ""
 178                         ,Instr "ldc" [Lit 0] ""
 179                         ,Instr "sth" [] ""]
 180     g (FunExpr _ k es fs) = getAdressbook >>= \ab->case 'Map'.get k ab of
 181                 //Identifier points to function
 182                 Just (LAB l arity fn) = if (arity <> (length es))
 183                         //Function is not complete
 184                         (       tell
 185                                         [Instr "ldc" [Lit fn] "Store function number"
 186                                         ,Instr "sth" [] ""
 187                                         ,Instr "ldc" [Lit $ length es] "Store arity"
 188                                         ,Instr "sth" [] ""
 189                                         ,Instr "ajs" [Lit -1] ""]
 190                                 >>| mapM_ g es
 191                                 >>| if (isEmpty es) (pure ()) (tell
 192                                         [Instr "stmh" [Lit $ length es] "Store arguments"
 193                                         ,Instr "ajs" [Lit -1] ""]))
 194                         //Function is complete
 195                         (       mapM_ g es
 196                                 >>| jump "bsr" k
 197                         >>| tell
 198                                         [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 199                                         ,Instr "ldr" [Raw "RR"] ""])
 200                 //Identifier points to variable, thus higher order function
 201                 Just (ADDR t arity) = if (arity <> (length es))
 202                         //Function is still  not complete
 203                         ( liftT (Left $ Error "Nope not implemented yet..."))
 204                         //Function is complete
 205                         ( fresh >>= \finish->
 206                           fresh >>= \start->
 207                           tell
 208                                 [Instr "ldl" [Lit t] ""
 209                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 210                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 211                                 ,Instr "ldc" [Lit 0] "Store offset"
 212                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 213
 214                                 ,Lab start
 215                                 ,Instr "ldr" [Raw "R5"] ""
 216                                 ,Instr "ldc" [Lit 0] ""
 217                                 ,Instr "eq" [] ""
 218                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 219                                 //Load heapadress
 220                                 ,Instr "ldl" [Lit t] ""
 221                                 ,Instr "ldr" [Raw "R6"] ""
 222                                 ,Instr "add" [] "Corrected heapaddress"
 223                                 ,Instr "ldh" [Lit 2] "Load argument"
 224                                 //Decrease available arguments
 225                                 ,Instr "ldr" [Raw "R5"] ""
 226                                 ,Instr "ldc" [Lit 1] ""
 227                                 ,Instr "sub" [] ""
 228                                 ,Instr "str" [Raw "R5"] ""
 229                                 //Increase available arguments
 230                                 ,Instr "ldr" [Raw "R6"] ""
 231                                 ,Instr "ldc" [Lit 1] ""
 232                                 ,Instr "add" [] ""
 233                                 ,Instr "str" [Raw "R6"] ""
 234                                 ,Instr "bra" [L start] ""
 235                                 ,Lab finish
 236                                 ]
 237                           >>| mapM_ g es
 238                           >>| tell
 239                                 [Instr "ldl" [Lit t] ""
 240                                 ,Instr "ldh" [Lit 0] "Get function number"
 241                                 ,Instr "str" [Raw "R5"] ""
 242                                 ,Instr "bsr" [L "1func"] ""
 243                                 ,Instr "ldr" [Raw "MP"] ""
 244                                 ,Instr "ldc" [Lit t] ""
 245                                 ,Instr "add" [] ""
 246                                 ,Instr "str" [Raw "SP"] ""
 247                                 ,Instr "ldr" [Raw "RR"] ""
 248                                 ]
 249                         )
 250                 Nothing = liftT (Left $ Error "Undefined function!!!")
 251
 252 jump :: String String -> Gen ()
 253 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 254         Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 255         Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
 256         Just (ADDR t arity) = liftT (Left $ Error "Address as jump???")
 257
 258 instance g Stmt where
 259     g (IfStmt cond th el) =
 260         fresh >>= \elseLabel->
 261         fresh >>= \endLabel->
 262         g cond >>|
 263         tell [Instr "brf" [L elseLabel] "branch else"] >>|
 264         mapM_ g th >>|
 265         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 266         tell [Lab elseLabel] >>|
 267         mapM_ g el  >>|
 268         tell [Lab endLabel]
 269     g (WhileStmt cond th) =
 270         fresh >>= \startLabel->
 271         fresh >>= \endLabel ->
 272         tell [Lab startLabel] >>|
 273         g cond >>|
 274         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 275         mapM_ g th >>|
 276         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 277         tell [Lab endLabel]
 278     g (AssStmt (VarDef k fs) e) =
 279         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 280             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 281             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 282             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 283     g (FunStmt k es fs) = mapM_ g es
 284         >>| jump "bsr" k
 285         >>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
 286         >>| mapM_ g fs
 287                 >>| pure ()
 288     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 289                 >>| tell [Instr "ret" [] ""]
 290     g (ReturnStmt (Just e)) = g e
 291                 >>| tell [Instr "str" [Raw "RR"] ""]
 292                 >>| g (ReturnStmt Nothing)
 293
 294 foldVarDecl :: Int VarDecl -> Gen Int
 295 foldVarDecl x (VarDecl _ mt k e) = g e
 296     >>| annote x k
 297         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 298         >>| pure (x + 1)
 299
 300 arity :: Type -> Int
 301 arity (_ ->> x) = 1 + arity x
 302 arity _ = 0
 303
 304 addVars :: Type [String] -> (Addressbook -> Addressbook)
 305 addVars _ [] = id
 306 addVars (t ->> ts) [x:xs] = \ab->
 307         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 308 addVars t [x] = \ab->
 309         extend x (ADDR -2 0) ab
 310
 311 instance g FunDecl where
 312     g (FunDecl _ k args mt vds stms) =
 313         //varDecls can call the enclosing function, so first reserve a label for it
 314         getAdressbook >>= \oldMap ->
 315                 updateAdressbook (addVars (fromJust mt) args) >>|
 316         tell [Lab k] >>|
 317                 tell [Instr "link" [Lit 0] ""] >>|
 318         //add the vars
 319         foldM foldVarDecl 1 vds  >>|
 320         //and the statements
 321         mapM_ g stms >>|
 322                 //Ugly hack to always return
 323                 g (ReturnStmt Nothing) >>|
 324         updateAdressbook (const oldMap) >>| pure ()
 325
 326 annote :: Int String -> Gen ()
 327 annote pos key =
 328     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "green", Raw key] ""]
 329
 330 class print a :: a -> [String]
 331
 332 instance print Instr where
 333     print (Lab l) = [l, ":", "\n"]
 334     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 335
 336 instance print [Arg] where
 337     print args = (map toString args)
 338
 339 instance toString Arg where
 340     toString (L l) = l
 341     toString (Lit int) = toString int
 342     toString (Raw s) = s
 343
 344 instance toString SSMProgram where
 345     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p