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 "ldc" [Lit 0] ""
 178                         ,Instr "stmh" [Lit 2] ""]
 179     g (LambdaExpr _ _ _) = liftT $ Left $ Error "PANIC: Lambdas should be transformed"
 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                         ( fresh >>= \finish->fresh >>= \start->tell [
 204                                 //Store function number
 205                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
 206                                 ,Instr "ldh" [Lit 0] "get function number"
 207                                 ,Instr "sth" [] "Store"
 208                                 //Store function arity
 209                                 ,Instr "ldl" [Lit t] "get pointer again"
 210                                 ,Instr "ldh" [Lit 1] "get function arity"
 211                                 ,Instr "ldc" [Lit $ length es] "add argument number"
 212                                 ,Instr "add" [] "add"
 213                                 ,Instr "sth" [] "Store"
 214                                 ,Instr "ajs" [Lit -1] "Adjust pointer"
 215                                 //load the arguments
 216                                 ,Instr "ldl" [Lit t] ""
 217                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 218                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 219                                 ,Instr "ldc" [Lit 0] "Store offset"
 220                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 221                                 ,Lab start
 222                                 ,Instr "ldr" [Raw "R5"] ""
 223                                 ,Instr "ldc" [Lit 0] ""
 224                                 ,Instr "eq" [] ""
 225                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 226                                 //Load heapadress
 227                                 ,Instr "ldl" [Lit t] ""
 228                                 ,Instr "ldr" [Raw "R6"] ""
 229                                 ,Instr "add" [] "Corrected heapaddress"
 230                                 ,Instr "ldh" [Lit 2] "Load argument"
 231                                 ,Instr "sth" [] "And store it immediatly after"
 232                                 //Decrease available arguments
 233                                 ,Instr "ldr" [Raw "R5"] ""
 234                                 ,Instr "ldc" [Lit 1] ""
 235                                 ,Instr "sub" [] ""
 236                                 ,Instr "str" [Raw "R5"] ""
 237                                 //Increase available arguments
 238                                 ,Instr "ldr" [Raw "R6"] ""
 239                                 ,Instr "ldc" [Lit 1] ""
 240                                 ,Instr "add" [] ""
 241                                 ,Instr "str" [Raw "R6"] ""
 242                                 ,Instr "bra" [L start] ""
 243                                 ,Lab finish
 244                                 ]
 245                           >>| mapM_ g es
 246                           >>| tell
 247                                         [Instr "stmh" [Lit $ length es] "Store extra args"
 248                                         ,Instr "ajs" [Lit -1] ""]
 249                         )
 250                         //Function is complete
 251                         ( fresh >>= \finish->fresh >>= \start->tell [
 252                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
 253                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 254                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 255                                 ,Instr "ldc" [Lit 0] "Store offset"
 256                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 257
 258                                 ,Lab start
 259                                 ,Instr "ldr" [Raw "R5"] ""
 260                                 ,Instr "ldc" [Lit 0] ""
 261                                 ,Instr "eq" [] ""
 262                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 263                                 //Load heapadress
 264                                 ,Instr "ldl" [Lit t] ""
 265                                 ,Instr "ldr" [Raw "R6"] ""
 266                                 ,Instr "add" [] "Corrected heapaddress"
 267                                 ,Instr "ldh" [Lit 2] "Load argument"
 268                                 //Decrease available arguments
 269                                 ,Instr "ldr" [Raw "R5"] ""
 270                                 ,Instr "ldc" [Lit 1] ""
 271                                 ,Instr "sub" [] ""
 272                                 ,Instr "str" [Raw "R5"] ""
 273                                 //Increase available arguments
 274                                 ,Instr "ldr" [Raw "R6"] ""
 275                                 ,Instr "ldc" [Lit 1] ""
 276                                 ,Instr "add" [] ""
 277                                 ,Instr "str" [Raw "R6"] ""
 278                                 ,Instr "bra" [L start] ""
 279                                 ,Lab finish
 280                                 ]
 281                           >>| mapM_ g es
 282                           >>| tell
 283                                 [Instr "ldl" [Lit t] ""
 284                                 ,Instr "ldh" [Lit 0] "Get function number"
 285                                 ,Instr "str" [Raw "R5"] ""
 286                                 ,Instr "bsr" [L "1func"] ""
 287                                 ,Instr "ldr" [Raw "MP"] ""
 288                                 ,Instr "ldc" [Lit t] ""
 289                                 ,Instr "add" [] ""
 290                                 ,Instr "str" [Raw "SP"] ""
 291                                 ,Instr "ldr" [Raw "RR"] ""
 292                                 ]
 293                         )
 294                 Nothing = liftT (Left $ Error "Undefined function!!!")
 295
 296 jump :: String String -> Gen ()
 297 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 298         Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 299         Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
 300         Just (ADDR t arity) = abort "NO ADDRESS JUMPING FFS"
 301
 302 instance g Stmt where
 303     g (IfStmt cond th el) =
 304         fresh >>= \elseLabel->
 305         fresh >>= \endLabel->
 306         g cond >>|
 307         tell [Instr "brf" [L elseLabel] "branch else"] >>|
 308         mapM_ g th >>|
 309         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 310         tell [Lab elseLabel] >>|
 311         mapM_ g el  >>|
 312         tell [Lab endLabel]
 313     g (WhileStmt cond th) =
 314         fresh >>= \startLabel->
 315         fresh >>= \endLabel ->
 316         tell [Lab startLabel] >>|
 317         g cond >>|
 318         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 319         mapM_ g th >>|
 320         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 321         tell [Lab endLabel]
 322     g (AssStmt (VarDef k fs) e) =
 323         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 324             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 325             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 326             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 327     g (FunStmt k es fs) = mapM_ g es
 328         >>| jump "bsr" k
 329         >>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
 330         >>| mapM_ g fs
 331                 >>| pure ()
 332     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 333                 >>| tell [Instr "ret" [] ""]
 334     g (ReturnStmt (Just e)) = g e
 335                 >>| tell [Instr "str" [Raw "RR"] ""]
 336                 >>| g (ReturnStmt Nothing)
 337
 338 foldVarDecl :: Int VarDecl -> Gen Int
 339 foldVarDecl x (VarDecl _ mt k e) = g e
 340     >>| annote x k
 341         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 342         >>| pure (x + 1)
 343
 344 arity :: Type -> Int
 345 arity (_ ->> x) = 1 + arity x
 346 arity _ = 0
 347
 348 addVars :: Type [String] -> (Addressbook -> Addressbook)
 349 addVars _ [] = id
 350 addVars (t ->> ts) [x:xs] = \ab->
 351         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 352 addVars t [x] = \ab->
 353         extend x (ADDR -2 0) ab
 354
 355 instance g FunDecl where
 356     g (FunDecl _ k args mt vds stms) =
 357         //varDecls can call the enclosing function, so first reserve a label for it
 358         getAdressbook >>= \oldMap ->
 359                 updateAdressbook (addVars (fromJust mt) args) >>|
 360         tell [Lab k] >>|
 361                 tell [Instr "link" [Lit 0] ""] >>|
 362         //add the vars
 363         foldM foldVarDecl 1 vds  >>|
 364         //and the statements
 365         mapM_ g stms >>|
 366                 //Ugly hack to always return
 367                 g (ReturnStmt Nothing) >>|
 368         updateAdressbook (const oldMap) >>| pure ()
 369
 370 annote :: Int String -> Gen ()
 371 annote pos key =
 372     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "green", Raw key] ""]
 373
 374 class print a :: a -> [String]
 375
 376 instance print Instr where
 377     print (Lab l) = [l, ":", "\n"]
 378     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 379
 380 instance print [Arg] where
 381     print args = (map toString args)
 382
 383 instance toString Arg where
 384     toString (L l) = l
 385     toString (Lit int) = toString int
 386     toString (Raw s) = s
 387
 388 instance toString SSMProgram where
 389     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p